单项选择题

It was very kind of him ______ the door for us.

A. for opening
B. and open
C. to open
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单项选择题
Stop! A little boy （） the street.

A. is crossing
B. crosses
C. has crossed
单项选择题
—Who （） the computer I want to use it.—Timmy. He （） it for a week.

A. borrowed; has borrowed
B. bought; has borrowed
C. has borrowed; has kept
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