单项选择题

"Could you find an answer to the problem in that book" "I looked at it, but it wasn't really ______".

A．much used
B．able to use
C．of much use
D．of usefulness
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单项选择题
For your safety and the safety of others, always ______ the traffic signals.
A．peek
B．heed
C．leak
D．clent
单项选择题
Tom didn't go to the party last night because he ______ the baby for his sister until 10:50.
A．had to look after
B．should have looked after
C．would have to look after
D．must have looked after
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