单项选择题

Tom ______ home because no one answered the phone.

A. must have left
B. can have left
C. should have left
D. may have left
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______ carefully, it will last at least about five years.
A. Using
B. To use
C. Used
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单项选择题
His understanding made a deep impression ______ the young girl.
A. in
B. on
C. for
D. to
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