单项选择题

David ______ his key at home and he couldn't get into his of-flee.

A． has forgot
B． forgot
C． left
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单项选择题
Let me tell you about our plans ______ the trip.
A． of
B． for
C． on
单项选择题
When will he come again When he______, I'll let you know.
A． come
B． comes
C． will come
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