[問題] 一題文法題（被動語態）

[wahaha212001 (Eros)]

阿被動語態加上時態變化真的是太令人煩惱了…

最近看到一題有點困惑，請各位幫忙看看…
The results_____by Frank before he reported them.
Now it's too late to mend the mistakes.

A.should be checked
B.should have checked
C.should have been checked
D.should be checking

我知道一定不是BD

覺得應該是C

可是答案是A

Why~~~~~~


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推 pttiris:這如果是考被動的話是A，但！題目的語意並不是考被動而是
→ pttiris:與過去相反的假設語氣，所以我也認為答案是C。
推 ginisisi:我覺得是A但我不會解釋
推 ginisisi:The answer is C because it's past tense and there nee
→ ginisisi:ds to be a be verb (been) for the sentence to make se
→ ginisisi:nse.(來自native speaker的答案)
推 peipei0919:是c
→ beabetterman:c
推 missmocca:與過去相反的假設+被動=c