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單項(xiàng)選擇題

We still do not know （）.

A.where is the trouble
B.where does the trouble
C.where the trouble lies
D.what is the trouble

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A moving object will not accelerate or decelerate （）a force is applied to it.

A.whether
B.if
C.unless
D.till

單項(xiàng)選擇題

When was your ship built? （）is a new oneShe was delivered to us by Bremen Shipyard only three months ago.

A.Ours
B.Ours ship
C.Our’s ship
D.Our’s

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