单项选择题

If no one ______ the phone, they must have gone out for breakfast.

A．answer
B．answered
C．had answered
D．has answered
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单项选择题
You ______ him out though you were very busy.
A．could have helped
B．must help
C．should have helped
D．ought to help
单项选择题
—Do you like a house with no garden—______ But anyhow, it's better to have one than none.
A．Not a bit.
B．Not a little.
C．Not especially.
D．Not really.
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