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
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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
单项选择题
If you explained the situation to your solicitor, he_______able to advise you much better than I can.
A．would be
B．will have been
C．was
D．were
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