单项选择题

James has just arrived, but I didn't know he_______until yesterday.

A．will come
B．was coming
C．had been coming
D．came
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单项选择题
Because fuel supplies are finite and many people are wasteful, we will have to install_______ solar heating device in our home.
A．some type of
B．some types of a
C．some type of a
D．some types of
单项选择题
That was not the first time he_______us. I think it's high time we_______strong actions against him.
A．betrayed.., take
B．had betrayed.., took
C．has betrayed.., took
D．has betrayed.., take
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