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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单项选择题
They are offering a substantial ______ for information leading to the capture of this murderer.
A．appraisal
B．reward
C．compensation
D．premium
单项选择题
I was speaking to Ann on the phone when suddenly we were ______.
A．hurry up
B．cut off
C．hurry back
D．cut down
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