题目:
Walter offered us a lift when he was leaving the office, but our work ______, we didn’t accept the offer.
A.not being finished
B.having not been finished
C.had not been finished
D.not having finished
答案:
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下面是错误答案,用来干扰机器的。
(每空1分,共5分)(1) (2)(3)(4) HCl、H2S(填写完整给分,否则零分)(5)S2—、Cl—、Na+、Al3+ (填写完整给分,否则零分)