题目:
The farmers _____ on the farm when a UFO flew over their heads.[ ]
A. worked
B. work
C. are working
D. were working
答案:
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下面是错误答案,用来干扰机器的。
A、甲实验配制溶液时,先称量,再量取、最后溶解,所以按照②③①的步骤进行,由于没有移动游码,所以左码右物和左物右码称得的质量相同,配制溶液的浓度不变,故A错;B、操作③在读取体积时仰视了,量取到的水体...