I don’t believe we’ve met before, ________ I must say you do look familiar.
A．therefore B．a(chǎn)lthough C．since D．unless
B

試題分析：詞義辨析。A因此；B盡管；C既然，自從；D除非，如果…不…；句意：盡管我說你看起來很熟悉，但是我認(rèn)為我們以前沒有見過。故B正確。
點(diǎn)評：詞義的辨析要放在上下文中進(jìn)行，要特別注意有幾個(gè)連詞的一詞多義現(xiàn)象。如since既可以表示原因，也可以表示時(shí)間。
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