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
Given these conditions, there will not be ______ room left in one's brain for ______ rational(理智的) thought.
A．a; the
B．/;a
C．the;/
D．/;/
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
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