单项选择题

The first thing ______ we should do is to work out a plan.

A. which
B. that
C. where
D. what
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单项选择题
I had my car ______ yesterday.
A. repaired
B. repairing
C. repair
D. to be repaired
单项选择题
I ______ two hours on this math problem.
A. spent
B. paid
C. cost
D. taken
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