單項(xiàng)選擇題

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

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

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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

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We have kept（）our friendship by writing to each other, so we are true friends.

A.back
B.up
C.off
D.down

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