单项选择题

I'll lend you my computer（）you promise to take care of it.

A．unless
B．while
C．as
D．if

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单项选择题

Seldom（）to see his uncle.

A．he goes
B．goes he
C．does he go
D．he does go

单项选择题

Many things（）impossible in the past are common today.

A．to consider
B．considering
C．being considered
D．considered

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