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
--Will you please spare me a few minutes now-- ______ . But I'll be free in half an hour.
A．No I can't
B．Yes, with pleasure
C．No problem
D．I'm afraid not
单项选择题
You'd better write down her number and address ______ you should need them.
A．unless
B．in case
C．on condition that
D．if only
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