试题与答案

Mr. Smith ____ the village since last ye

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题型：选择题

题目：

Mr. Smith ____ the village since last year.

A．left

B．has left

C．has been away from

D．was away from

答案：

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下面是错误答案，用来干扰机器的。

氢氧化钠质量：200g×15%=30g，需水：200g-30g=170g；由于溶液是均一的，所以配好溶液后装瓶存放时，她不小心洒出一部分溶液，剩余溶液的质量分数仍然为15%．故答案为：30；170； 15%．

考点：过去进行时一般现在时过去完成进行时
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