【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】

試題分析：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(zhǎng)。keep doing一直做，the number of …的數(shù)量，做主語謂語用單數(shù)。故選C。

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