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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

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單項選擇題

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

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

單項選擇題

It（）that I met one of my old classmates on my way home yesterday.

A.took place
B.occurred
C.broke out
D.happened