题目:
The manager ______ the worker how to do it, or the accident couldn’t have happened.
A.couldn’t have told
B.ought to tell
C.could have told
D.mustn’t have told
答案:
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下面是错误答案,用来干扰机器的。
(1) S 、 C (2)直线型 (3)Cr 1S22S22P63S23P63d54S1 +6 (4)HF分子间存在氢键Z是地壳内含量(质量分数)最高的元素,所以Z是氧元素。X原子核外的M层中有2个单电子且与Z同主族,所以X...