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
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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.
单项选择题
Once lost______.
A．it is hard to get such a chance again
B．to get such a chance will be difficult
C．one can never get such a chance again
D．such a chance might never come again
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