SC困惑的不只有我们，母语是英文的也同样如此，看了这些答复，释然了

RaymondoLUO

Of all the vast tides of migration that have swept
through history, maybe none is more concentrated as
the wave that brought 12 million immigrants onto
American shores in little more than three decades.
(A) maybe none is more concentrated as
(B) it may be that none is more concentrated as
(C) perhaps it is none that is more concentrated
than
(D) maybe it is none that was more concentrated
than
(E) perhaps none was more concentrated than

What is wrong with choice (d)? thx!


D has many issues:
1. "is" is in present tense, while the sentence demands past tense.
2. "it" is not required in D as the pronoun "it" does not refer to any antecedent. Hence, it more acts like a demonstrative pronoun, which is not required here.
3. When you say "it is none that was", you are stressing on "none", while the sentence construction does not need this stress.
4. Just another thought - "maybe" is an informal use of "perhaps". "perhaps" is formal. But, just this does not clearly make D wrong.



Thanks,
Arun