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單項選擇題

Put the（） on the lines.

A. rat guards
B. stopping guards
C. fenders
D. planks

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We should （）the national flag when the sun rises.

A.hoist
B.hoists
C.hoisting
D.hoisted

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The main tasks for sailors on duty are, first of all,（）the persons who come on board to do their business.

A.received
B.receives
C.receiving
D.receive