I had been working on math for the whole afternoon and the numbers        before my eyes.
A．swimB．swum
C．swamD．had swum
C
主句用過去完成進行時，所以后半句用一般過去時，只有這樣才能具備“過去的過去”的條件。句意：我一整個下午都在做數(shù)學(xué)題，那些數(shù)字在我的眼前暈眩。
【考點定位】考查動詞時態(tài)。
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