单项选择题

His success was due partly to （） he had been working hard.

A.that
B.the fact which
C.being followed
D.having followed

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单项选择题

I would have gone shopping with you, but I （） so tired that I went to bed quite early.

A.were
B.had been
C.was
D.have been

单项选择题

In the advanced course, students must take objective tests （） monthly intervals.

A.with
B.on
C.for
D.at

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