单项选择题

Mr. Johnson prefered（）the job of looking after the children.

A、to be assigned
C、to have assigned
B、to be assigning
D、having assigned

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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
单项选择题
（）they will produce cars next years or not hasn't been made clear.

A.Whether
B.That
C.If
D.What
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