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單項選擇題

We have just received a message from shore（）assistance is on the way.

A.When
B.Where
C.how
D.that

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單項選擇題

（）we stand away from the church bell, it takes time for the sound waves to reach us.

A.If
B.Whenever
C.Because
D.Where

單項選擇題

Before（）, a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.

A.transmit
B.to transmitting
C.transmitting
D.in transmitting

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