问题

________ knowledge can be acquired from books，skills must be learned through practice.[ ]

A:Whereas
B:When
C:Unless
D:As

正确答案是：

同类题型

下列词语中没有错别字的一项是（）

Where is my bag — _____ is on the desk.

The authors of computer viruses are geniuses.—— I agree. They can apply their wisdom to other net technology ________ human beings can benefit.

1–Why not _______ to London for holidays–Good idea.

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