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單項選擇題

It is assumed that students at an intermediate level will have a good（）of the basic structures and vocabulary of English.

A.command
B.commanding
C.to command
D.commanded

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單項選擇題

I am pleased to take（）to exchange views with you.

A.this opportunity
B.a chance
C.this time
D.aperiod

單項選擇題

Please leave the key under the door（）you go out.

A.in case
B.in the case
C.in case of
D.in the case of