At first we were quite ______ as to the object of his trip,b

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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

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 fond of traveling by sea?
我可以问一下你是否喜欢海上旅行?

3. All the villagers took to the boats to defend their island against the attackers arriving by sea.
全体村民上了船,抵抗海上的来犯者,保卫他们的海岛.

4. An area of open water surrounded by sea ice.
冰间湖由海水冰围成的一块开阔的水域
at sea: ad. 离开陆地(茫然)
例句与用法:
1. He felt completely at sea in his new school.
他在新学校中感到茫然不知所措.

At first we were quite ______ as to the object of his trip,b I remember my first trip to the Mount Tai as if it were yest We were surprised at the news of his ( ) (die) ------------we first heard of the man referred to as compute 1.We were all a bit ______ of him at first 2.It made him ang as the first were made to 11:The trip has ______ his memory of his childhood. Many of them were moved to tears, as it was the first time f 1.( ) we stood at the top of the building,we were able to en We were behind the other team at first的意思 As we were listening to zhe radio,someone knocked at the doo 3We were about to climb up to the top of the mountain ______