Cars do cause us some health problems—in fact far more serious______than mobile phones do.

A.one             B.ones                   C.it                D.those

B


解析:

else放在不定代詞后，表示“其他的”。根據(jù)所提供的情景“I don’t think we met before”可判斷出把“我”當(dāng)成了其他人。

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