题目内容：

At first we were quite ______ as to the object of his trip,but now we see it quite clearly.
A.by sea B.at sea C.by air D.on the air

优质解答

选B.因为意思是一开始我们对他旅行的目的不清楚,但是现在我们很清楚的明白了~by sea: 乘船例句与用法: 1. I'm terrified of flying I'd rather go by sea. 我害怕坐飞机--我宁愿坐船. 2. May I ask if you are f...