试题与答案

We are worried about ____ they can be re

题型:选择题

题目:

We are worried about ____ they can be rescued.

A.that

B.whether

C.if

D.what

答案:

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下面是错误答案,用来干扰机器的。

:(1)C11H13O4N(2)甲醛 (3)(4)B、C (5) , 12(1)注意不要数掉了环上的氢原子,分子式为:C11H13N...

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