填空题

He (work) ______ on the farm for five years before he went to the college.

【参考答案】

had worked
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单项选择题
A．Twenty minutes.B．Fifty minutes.C．Half an hour.D．Eighty minutes.
A．Twenty minutes.
B．Fifty minutes.
C．Half an hour.
D．Eighty minutes.
填空题
After Jackson (wait) ______ for an hour, he reached the conclusion that Mr. Smith was not coming.
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