单项选择题

—I think you ought to have your paper finished.
—Yes, I ______.

A. would
B. ought
C. should
D. should have
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单项选择题
The plane is a form of transportation whose ______ we take for granted.
A. convenience
B. construction
C. satisfaction
D. insurance
单项选择题
The nurse walked on tiptoe for fear that she ______ the patient.
A. should wake
B. would wake
C. had waken
D. woke
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