I had been working on math for the whole afternoon and the numbers ________ before my eyes.

A．swim B．swam C．swimming D．had swum

B

解析試題分析：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(guò)去完成進(jìn)行時(shí)，所以后半句用一般過(guò)去時(shí)，只有這樣才能具備“過(guò)去的過(guò)去”的條件。選B。
考點(diǎn)：考查動(dòng)詞時(shí)態(tài)

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