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----You seem to have known Dr Smith for a long time.
---- That’s true. ______ he joined our club six years ago.
A.SinceB.UntilC.WhenD.Before
A
介词辨析. A.自从……    B.直到,常和not一起连用;C.当……时候  D. 在……之前。根据题意,你好像认识史密斯博士好久了。——这是真的。自从他六年前加入我们俱乐部以来就认识。故选A。
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