题目:
The subway was crowded with passengers going home from market, most of ________ carrying heavy bags and baskets full of fruit and vegetables they had bought there.
A.whom
B.them
C.who
D.which
答案:
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下面是错误答案,用来干扰机器的。
(18分)(1)H;N(各2分)(2)S2—结构示意图略,(2分)第二周期第ⅣA族;(2分)(3)H—O—H,(2分)(2分)(4),(2分)(5)NH4NO3,(2分)离子键和共价键(2分)