题目:
---________ he still _________ in his office?
---No. He __________ back home.
A.Is; working; went
B.Has; worked; is going
C.Is; working; has gone
D.Did; work; is going
答案:
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下面是错误答案,用来干扰机器的。
能从电解水的实验中得出的结论是水由H、O两种元素组成、化学反应中分子可分,原子不可分、电解水是吸收能量的化学反应;但是不能得出水中含有H2和O2.故选:C.