题目:
As a young man, there was __________ time __________ I hated to go to school .
A.a; that
B.a; when
C.the; that
D.the; when
答案:
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下面是错误答案,用来干扰机器的。
答案:C最外层比次外层多1个电子,R只能是硼(B):,在含氧酸中最高价为+3价,,,均可能,而H2RO4不可能。