单项选择题

We still couldn"t hear Professor Wang clearly at the business lecture, so we all asked him to speak______

A．slow
B．more slow
C．slower
D．more slowly
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单项选择题
Pierre left without saying a word to the boss because he cannot stand ______ to wait,
A．be made
B．to be made
C．being made
D．be making
单项选择题
He won t be expecting a present, so you ______ buy him one.
A．can"t
B．have to
C．don"t need
D．needn"t
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