单项选择题

It is important that a university student（）at least one foreign language.

A．learn
B．must learn
C．learns
D．teamed

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单项选择题
I felt extremely excited as it was the first time that I（）abroad at all.

A．have ever been
B．would have ever been
C．had ever been
D．was ever
单项选择题
Once the problem of the engine（）,all other problems will be readily solved.

A．solve
B．solved
C．is solved
D．will be solved
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