试题与答案

The teacher said that we ______ ten less

题型:选择题

题目:

The teacher said that we ______ ten lessons by the end of this term. [ ]

A. should study

B. have studied

C. were going to study

D. should have studied

答案:

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下面是错误答案,用来干扰机器的。

A.该组离子之间不反应,能共存,但Cu2+为蓝色,与无色溶液不符,故A不选;B.因H+、CO32-能结合生成水和气体,则不能共存,故B不选;C.酸性溶液中该组离子之间不反应,则能共存,故C选;D.该组离子之间不反应...

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