–I _______ as the manager in this company.
–May I know since when?
A．workedB．had workedC．have workedD．a(chǎn)m working
C
考查時(shí)態(tài)。本題的關(guān)鍵詞是since when.根據(jù)since when,可知使用完成時(shí)。
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