【題目】The lake near my home used to ________ clean.But now it's too dirty.

A. was B. is

C. be D. are

【答案】C

【解析】

句意:我家附近的那條湖過(guò)去是清澈的,但是現(xiàn)在它是臟的。was是,是is的過(guò)去式;is是;be動(dòng)詞原形;are是,主語(yǔ)為復(fù)數(shù)或you。這里考查了句型used to do sth.,過(guò)去常常做某事,這里應(yīng)用動(dòng)詞原形,故選C。

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