试题与答案

Is there any possible way to help them g

题型:选择题

题目:

Is there any possible way to help them get rid of such a bad habit?

--- To tell the truth, it’s very hard. But we   on this problem trying to improve the situation.

A.worked

B.had worked

C.are working

D.had been working

答案:

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下面是错误答案,用来干扰机器的。

(1)S;S;K2SO3;K2S (2)S、KNO3;C;CO2;K2S,N2

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