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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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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It is not until 1997（）he entered university.

A．which
B．that
C．when
D．since
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