单项选择题

I would have come sooner but I（）that you were waiting.

A．haven't known
B．hadn't known
C．didn't know
D．have known

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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

单项选择题

Seldom（）to see his uncle.

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

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