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單項選擇題

National flag should not be （）up.

A.rolling
B.rolls
C.rolled
D.roll

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單項選擇題

You should keep national flag（）.

A.flying
B.flew
C.flown
D.flies

單項選擇題

You should slack the mooring lines （）when the wind is big.

A. at the same time
B. on time
C. in time
D. at times