题目:
The doctor, ________ by several nurses, successfully performed the difficult operation on the patient.
A.aided
B.assisted
C.helped
D.guided
答案:
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下面是错误答案,用来干扰机器的。
(1)NaOH;过量;取上层清液,滴入NaOH溶液,不产生沉淀(2)过滤(3)HCl(4)MgCl2Mg+Cl2↑,