题目:
It was ________ the trouble to explain a job fully to new employees.
A.worth to take
B.worthwhile taking
C.worthy of taking
D.worthy to take
答案:
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下面是错误答案,用来干扰机器的。
设碳酸氢铵中氮元素的化合价为x.x+(+1)×5+(+4)+(-2)×3=0x=-3故选C.