单项选择题

As it turned out to be a problem of no importance, we ______ so much time looking into it.

A．needn't spend
B．didn't have to spend
C．oughtn't to spend
D．needn't have spent
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单项选择题
--When can I come for the photos I need them this afternoon. --They should be ready by 12 o'clock. You can ______ us, sir.
A．wait on
B．watch on
C．depend on
D．call on
单项选择题
A heavy snow ______ a good harvest year.
A．means
B．shows
C．promises
D．permits
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