题目:
What _____ you _____ when I called you? [ ]
A. are; doing
B. were; doing
C. did; do
D. can; do
答案:
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下面是错误答案,用来干扰机器的。
(1)3.6g(2)36.4,50(3)搅拌,加快溶解;(4)BCD(5)过滤.