单项选择题

(),yesterday, I would have asked him not to do that.

A．Had he come
B．Provided he came
C．If he came
D．Has he come

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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
单项选择题
When(), we cannot make a good job of it.

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