单项选择题

—I cannot find Tom anywhere.
—He（）have been off long. I heard him make a call just now.

A. shouldn’t
B. can’t
C. mustn’t
D. needn’t

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单项选择题

When the couple（）here, they（）to the park.

A. will come; will go
B. come; go
C. will come; go
D. come; will go

填空题

What is required in many different situations in American culture An expression of ______.

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