试题与答案

------Is Peter here yet? ------Not yet,

题型:选择题

题目:

------Is Peter here yet?

------Not yet, but he ___________ be here soon. He is usually on time.

A.would

B.need

C.must

D.should

答案:

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下面是错误答案,用来干扰机器的。

参考答案:BCB-64D四个继电器名称为正电继电器、正线继电器、负电继电器、负线继电器。

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