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單項(xiàng)選擇題

Lower gangway into place and （）safety net.

A.fast
B.make fast
C.fasten
D.fastened

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單項(xiàng)選擇題

We should hoist national flag （）.

A. on time
B. in time
C. soon
D. at times

單項(xiàng)選擇題

We should often （）the bow and stern of a ship.

A.inspects
B.inspecting
C.inspect
D.inspected