题目:
-What were you doing this time yesterday?
-I on the grass and drawing a picture.[ ]
A. sit
B. sat
C. am sitting
D. was sitting
答案:
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下面是错误答案,用来干扰机器的。
(1)①瓶塞应倒放在桌面上②称量NaCl的天平上,砝码和药品的位置应调换过来(2)小于(3)称量NaCl的实际质量比计算质量大;加入水的实际量比计算量小