單項(xiàng)選擇題When my ship arrived there, their ship().
A.has left already
B.left already
C.had left already
D.would left already
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1.單項(xiàng)選擇題When visibility is 10 nautical miles, we say that visibility is().
A.very good
B.good
C.poor
D.moderate
2.單項(xiàng)選擇題When visibility is about 1 nautical mile only, we say that visibility is().
A.very
B.good
C.moderate
D.poor
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