单项选择题

Many people agree that（）knowledge of English is a must in（）international trade today.

A. a; /
B. the; an
C. the; the
D. /; the

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单项选择题
They will be back home（）

A. a week later
B. after a week
C. in a week
D. a week
单项选择题
（）his father had come, his face lit up.

A. Having learned
B. When he learned
C. Heating
D. When learning
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