单项选择题

Did you notice him ______

A. crossed the road
B. across the road
C. having crossed the road
D. cross the road
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单项选择题
The man who saw the truck ______ into the river didn’t phone the police station.
A. plunged
B. plunge
C. was plunging
D. to plunge
单项选择题
The students are staying up late these days ______ for the final exams.
A. to preparing
B. to prepare
C. being prepared
D. prepared
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