单项选择题

It's not difficult to （） the idea that machines can communicate information to us.

A、admit
B、receive
C、accept
D、convince

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单项选择题

I hope that you'll be more careful in typing the letter. Don't （） anything.

A、withdraw
B、omit
C、reduce
D、leak

单项选择题

You must pay the money, but you （） do so now.

A、mustn't
B、can't
C、may not
D、needn't

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