单项选择题

It______last night, because the ground is wet.

A) rain
B) must rain
C) must have rained
D) rained
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Would you mind______it to me once again
A) explaining
B) to explain
C) explain
D) explained
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You're too tired. Why not______the time for a holiday
A) to spend
B) save
C) spare
D) to afford
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