单项选择题

______ a contract last year and it is still valid.

A．We have signed
B．We signed
C．We haven't signed
D．We have signed
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单项选择题
Let me help you, ______
A．won't yon
B．will you
C．shall I
D．shan't I
单项选择题
______ we choose the seventh floor instead of the sixth of the new building Do you think that therewill be more sunshine
A．If only
B．What if
C．As if
D．Even if
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