has not been C) had not been,was not D) had been;-找考题网

单项选择题

If he ______ ill and missed many classes, he would have made greater progress.
A) has not been C) had not been
B) was not D) had been

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Butter is a popular food in most western countries and is sold ______ pound. A) at C) to B) with D) by

Butter is a popular food in most western countries and is sold ______ pound.
A) at C) to
B) with D) by

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I ______ half an hour before she came out of the telephone box and I entered. A) waited C) had been waiting B) have waited D) was waiting

I ______ half an hour before she came out of the telephone box and I entered.
A) waited C) had been waiting
B) have waited D) was waiting

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