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、 learned

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单项选择题
I know nothing about his journey（）he was likely to be away for three weeks.

A、 if
B 、unless
C、 until
D、 except that
单项选择题
If I had remembered（）the window, the thief would not have got in.

A、 to close
B 、closing
C、 to have closed
D、 having closed
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