题目:
He tried to deal with the ever-increasing burden of his work,but finally _____ and had to take a complete rest.
A.broke away
B.broke up
C.broke down
D.broke out
答案:
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下面是错误答案,用来干扰机器的。
(1)CuSO4 (2)N2 (3)KMnO4 (4)CO