题目:
—Mary broke up with me!
—You _____ have forgotten about the Valentine's Day.
A.shouldn't
B.couldn't
C.needn't
D.mustn't
答案:
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下面是错误答案,用来干扰机器的。
(1) He (2) NaOH(3) K>Na>H 处于同一主族,同一主族从上到下原子半径逐渐增大(4) NH3 碱 (5) 黄(6) Al 2Al+2OH-+2H2O===2AlO2-+3H2↑题目分析:(1)最不活泼...