单项选择题

Agriculture is the country's chief source of wealth, wheat （） by far the biggestcereal crop.

A．is
B．been
C．be
D．being

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单项选择题
Time（） , the celebration will be held as scheduled.

A．permit
B．permitting
C．permitted
D．permits
单项选择题
Jack（） from home for two days now, and I am beginning to worry about his safety.

A．has been missing
B．has been missed
C．had been missing
D．was missed
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