单项选择题

Alexander Graham Bell invented（）telephone in 1876.

A．one
B．a
C．the
D．none of the above

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单项选择题
May I speak to your manager Mr. Williams at five o'clockI'm sorry. Mr. Williams（）to a conference long before then.

A．will have gone
B．mustn't follow
C．couldn't have been following
D．shouldn't have been following
单项选择题
Why is the woman tired（）

A．She is on the committee.
B．She has been working late.
C．She exercises too much.
D．She is trying to account for the report.
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