----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
介詞辨析. A.自從……    B.直到，常和not一起連用；C.當(dāng)……時(shí)候  D. 在……之前。根據(jù)題意，你好像認(rèn)識(shí)史密斯博士好久了�！@是真的。自從他六年前加入我們俱樂部以來(lái)就認(rèn)識(shí)。故選A。
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