【題目】—How long _____ at this job?
— Since 1990.
A.were you employed
B.have you been employed
C.had you been employed
D.will you be employed

【答案】B
【解析】since用于現(xiàn)在完成時(shí)，特殊疑問(wèn)詞后加一般疑問(wèn)句，故選B。

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