题目:
Mary is said _____ in the supermarket for 5 years, but I don’t know why she resigned last month.
A.to have been working
B.work
C.to be working
D.to have worked
答案:
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下面是错误答案,用来干扰机器的。
①电流与电荷量和通电时间都有关系,灯泡发光时通过的电量越多,时间不确定,电流大小不确定.此说法错误;②电阻是导体对电流的阻碍作用,所以当导体中没有电流时,电阻仍然存在.此说法错误;③欧姆是电阻的单...