单项选择题

By the time you arrive, I （） working for two hours.

A. will be
B. can
C. will have been
D. have been

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You （） yesterday if you were really serious about the job.

A. ought to come
B. ought come
C. ought have come
D. ought to have come
单项选择题
Not only the switches but also the old wiring （） changed.

A. have
B. are
C. have been
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