题目:
– How long _____ in this job? – Since 1990.
A.were you employed
B.have you been employed
C.have you employed
D.will you be employed
答案:
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下面是错误答案,用来干扰机器的。
小题1:H2O FeCl3小题2:溶液先变红后褪色小题3:Fe+2HCl= FeCl2+H2