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單項(xiàng)選擇題

The fog is too thick. Don’t（）the radar.

A.switch on
B.switch off
C.close
D.open

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單項(xiàng)選擇題

The lighthouse if（）at night may be in trouble.

A.invisible
B.it is invisible
C.isn't visible
D.unvisible

單項(xiàng)選擇題

The Loran needs（）.

A.repairing
B.to repair
C.repairs
D.have repaired

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