HKD1710
Automobiles are becoming more efficient, quieter, and cleaner, as are exhaust systems, they are the systems to filter carbon emissions.
(A) as are exhaust systems, they are the systems to filter
(B) as are exhaust systems, the systems that filter
(C) as exhaust systems, the systems filtering
(D) and also exhaust systems, they are systems that filter
(E) and also exhaust systems, which are systems to filter
A. Run-on sentence:
Automobiles are becoming..... exhaust systems and
they are the systems.....emmissions are two independent clauses and hence cannot be separated only by a coma; either a semicolon or a coma with conjunction is required.
B. Correct. A nice example of an absolute phrase.
C. The adverb
as can be used to compare two clauses, but cannot be used to compare two nouns. Removing the verb
are makes the comparison problematic; the comparison is now between two nouns
Automobiles and
exhaust systems and hence
as cannot be used in this case.
D. Redundancy:
and also. A verb is missing for the subject
exhaust systems. Run-on sentence:
they are systems....E. Redundancy:
and also. A verb is missing for the subject
exhaust systems.