单项选择题

We didn't finish the work in time. You（）us since you were there.

A. might help
B. should help
C. could have helped
D. must have helped

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In earlier days, local trade was（）more important.

A. many
B. very
C. much
D. too
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Language is a city, to the building of（）every humanbeing has brought a stone.

A. which
B. that
C. it
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