【題目】—Why does the lake smell terrible?

—Because large quantities of water .

A. have polluted B. have been polluted

C. is being polluted D. has been polluted

【答案】B

【解析】

試題分析：B；考查性數(shù)一致。根據(jù)分析，可知時(shí)態(tài)用現(xiàn)在完成時(shí)表示一個(gè)結(jié)果。主語(yǔ)是large quantities of water是一個(gè)復(fù)數(shù)形式，所以謂語(yǔ)動(dòng)詞也應(yīng)該用復(fù)數(shù)形式，水污染應(yīng)該是被污染，所以謂語(yǔ)還應(yīng)該體現(xiàn)被動(dòng)語(yǔ)態(tài)。句意：——為什么湖水這么難聞？——因?yàn)榇罅康乃晃廴玖�。故選B

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