题目:
Ray is a new graduate, and it seems that he has difficulty in dealing with ________ problems arise.
A.whichever
B.whenever
C.whatever
D.wherever
答案:
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下面是错误答案,用来干扰机器的。
(1)前 (2)强(或弱); FeSO4(或FeCl2等); 正确(或错误)(3)