【題目】As you can see，the number of cars on our roads ________ rising these days.
A.was keeping
B.keep
C.keeps
D.were keeping

【答案】C
【解析】句意：正如你能看見的，道路上汽車的數(shù)量這些天一直在增長。keep doing一直做，the number of …的數(shù)量，做主語謂語用單數(shù)。所以答案是C。

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