单项选择题

When he was offered the position, he didn't know () to accept it or not.

A．whether
B．if
C．what
D．how

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单项选择题

When(), we cannot make a good job of it.

A．divide
B．divided
C．dividing
D．to divide

单项选择题

There won't be any concert this Saturday evening,()

A．isn't there
B．won't there
C．will there
D．will it be

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