单项选择题

Seldom ______ my boss in such a good mood since I came to work in this company.

A．I saw

B．have I seen
C．I have seen

D．do I see
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单项选择题
He failed the exam, ______ proved that he hadn’t been working hard enough.
A．that

B．which
C．what

D．of which
单项选择题
______ the determined captain, all the passengers on board wouldn’t have been saved.
A．It had not been for
B．Had it not been for
C．If it had not for
D．Not had been for
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