globaldesi
Southern Mesopotamia is an alluvial country, and the ancient cities, which doubtless marks the sites of the oldest settlements in the land, are situated in the alluvial marshy plain between the Tigris and the Euphrates; so that all traces of the Neolithic culture of the country has disappeared, buried deep beneath city-mounds, clay and marsh.
A. , which doubtless marks the sites of the oldest settlements in the land, are situated in the alluvial marshy plain between the Tigris and the Euphrates; so that all traces of the Neolithic culture of the country has
B. , which doubtless marks the sites of the oldest settlements in the land, are situated in the alluvial marshy plain among the Tigris and the Euphrates; as a consequence, all traces of the Neolithic culture of the country would have certainly
C. , which doubtless mark the sites of the oldest settlements in the land, are situated in the alluvial marshy plain between the Tigris and the Euphrates, so that all traces of the Neolithic culture of the country have
D. , which doubtless mark the sites of the oldest settlements in the land, are situated in the alluvial marshy plain between the Tigris and the Euphrates; however, all traces of the Neolithic culture of the country
E. that doubtless mark the sites of the oldest settlements in the land, are situated in the alluvial marshy plain among the Tigris and the Euphrates; however, all traces of the Neolithic culture of the country has
Correct answer: D
(A): Incorrect. Singular verb "marks" is incorrectly paired with plural noun "cities." Further, singular verb "has" is incorrectly paired with plural noun "traces." Also, "so that" implies a causality that is not clear.
(B): Incorrect. (B) has the same subject/verb error in "marks." Further, (B) incorrectly uses "among" to mean between (i.e. in the middle of) two things. The "would have" conditional is also suspect, given no setup for the conditional.
(C): Incorrect. (C)'s use of "so that" creates a causality that is not clear in a logical reading of the sentence; the sentence is stating that although it is likely known where the oldest settlements were, those settlements were lost to nature. Also, "so that ..." is not an operable standalone sentence as required by the preceding comma.
(D): Correct. (D), unlike (C), establishes the contrast with the conjunction "however."
(E): Incorrect. The comma before "that" and after "land" indicate that the nonessential modifier "which" should be used. Further, singular verb "has" incorrectly matches plural noun "traces."