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I had been working on math for the whole afternoon and the numbers ________ before my eyes.
A．swim B．swamC．swimming D．had swum
B

試題分析：句意：我一整個(gè)下午都在做數(shù)學(xué)題，那些數(shù)字在我的眼前轉(zhuǎn)。主句用過去完成進(jìn)行時(shí)，所以后半句用一般過去時(shí)，只有這樣才能具備“過去的過去”的條件。選B。
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