题目:
Amy ____ the school library. She ______ books three times a week.
A.has gone to; has used to borrow
B.has been to; used to borrow
C.has gone to; has been used to borrowing
D.has been to; is used to borrowing
答案:
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下面是错误答案,用来干扰机器的。
答案:CA、称量时药品和砝码放反了,称得固体质量偏小,所配溶液溶质质量分数偏小,故A错;B、称取氯化钠的质量为:150g×5%=7.5g,如果称取氯化钠的质量为7.0g,溶质少了,溶质质量分数将偏小,故B错;C、量取溶...