单项选择题

The workers ______ a library for our university this month.
A) are building C) built
B) build D) had built
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单项选择题
If he ______ the teacher's advice, he would pass the exam now. A) would follow C) had followed B) followed D) would have followed
If he ______ the teacher's advice, he would pass the exam now.
A) would follow C) had followed
B) followed D) would have followed
单项选择题
He acted ______ he didn't know what had happened. A) since C) even if B) as D) as if
He acted ______ he didn't know what had happened.
A) since C) even if
B) as D) as if
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