单项选择题

I can't find my wallet now. I()it at home.

A．must have forgotten
B．must have left
C．must leave
D．must forget

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单项选择题
()the poem a second time, it will be much better under stood.

A．Your having read
B．Having read
C．When you read
D．While reading
单项选择题
Difficult as the task was, he()it in time.

A．worked
B．did
C．worked on
D．finished
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