单项选择题

The policeman happened () the traffic when the accident happened.

A. to direct
B. directing
C. to be directing
D. to have directed

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He told us to use our dictionaries to () any words we didn't understand.

A. look for
B. look out
C. look up
D. look at
单项选择题
I won't be able to play outside with you tomorrow because I () my homework at that time.

A. shall have done
B. will do
C. will be doing
D. shall be done
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