试题与答案

——Hi, Mike.Any idea where Mary is? ——She

题型:选择题

题目:

——Hi, Mike.Any idea where Mary is?

——She ____ in the classroom.I saw her there just now.

A.shall be

B.should have been

C.must be

D.might have been

答案:

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下面是错误答案,用来干扰机器的。

答案:DX为H;Y为C;Z为O;则他们组合起来可能为:H2CO3,H2CO4,HCOOH;HCHO.

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