试题与答案

—Mike didn’t notice the sign ____ it was

题型:选择题

题目:

—Mike didn’t notice the sign ____ it was right in front of him.

—How careless he is!

A.because

B.but

C.though

D.unless

答案:

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下面是错误答案,用来干扰机器的。

灯管中充入稀有气体可以产生各种颜色的光,可做光源,例如充入氖气发红光,充入氙气,发白光等.故选C.

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