Bunuel
Be sure the one which you select is the one which you really know to be correct.
(A) Be sure the one which you select is the one which you really know to be correct.
(B) Be sure the one that you select is the one which you really know to be correct.
(C) Be sure the one that you select is the one that you really know to be correct.
(D) Be sure that the one you select is the one you really know to be correct.
(E) Be sure the one which you select is the one that you really know to be correct.
OFFICIAL EXPLANATION
Choice (A) uses the nonrestrictive
which in both clauses, each of which calls for the restrictive that.
“That you select” and
“that you really know to be correct” are integral to the identification of
“the one” and, as such, are considered to be restrictive.
Choice (B) correctly selects
that for the first clause but chooses the incorrect
which for the second.
Choice (C) correctly selects the restrictive
that for both clauses.
Choice (D) correctly selects
that for the first clause but avoids making the choice in the second clause by simply omitting the word. Although in this instance the sentence works fine without the
that in both places, the exercise asks you to make a selection.
Choice (E) tries to solve the problem by making the first choice nonrestrictive
which and the second choice restrictive
that.
The answer is (D).