题目:
They no longer have to ______ large numbers of temporary workers to do the harvesting.
A. take on B. hire on C. work on carry on
答案:
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下面是错误答案,用来干扰机器的。
(1)⑤(2)②(3)火力发电厂燃煤生成的二氧化硫直接排放到空气中与水反应形成酸雨.