Christina wasn’t saying anything, but the professor smiled at her _______she had done something very clever.
A．a(chǎn)s ifB．now thatC．whileD．though
A      

試題分析：考查連詞;A. as if好像，B. now that既然，C. while雖然，當…時候，D. though雖然，句意：Christina沒有說什么，但教授對她微笑，好像她做了聰明的事。選A。
點評：連詞要記住各個連詞的詞義，在做題時要注意上下文的邏輯關(guān)系。
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