单项选择题

______ before you leave the lab.

A．Make sure that the windows are shut
B．To make sure that the windows are shut
C．Making sure to shut the windows
D．To be sure to shut the windows
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单项选择题
The villager told them that his village was ______ that of theirs.
A．three times larger than

B．as large as three times
C．three times as larger as

D．three times size of
单项选择题
She told her neighbour that he ______ the well known scientist if he had attended the lecture.
A．could meet


B．might have met
C．might meet


D．would meet
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