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單項(xiàng)選擇題

We were sorry for any（）convenience caused by the late arrival of the train.

A.un
B.in
C.im
D.dis

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單項(xiàng)選擇題

All of our customers will be contacted（）

A.by mail
B.by the mail
C.by mails
D.by a mail

單項(xiàng)選擇題

Please（）to get there on time.

A.make effort
B.make efforts
C.make the efforts
D.make an effort