【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，可知時態(tài)用現(xiàn)在完成時表示一個結(jié)果。主語是large quantities of water是一個復(fù)數(shù)形式，所以謂語動詞也應(yīng)該用復(fù)數(shù)形式，水污染應(yīng)該是被污染，所以謂語還應(yīng)該體現(xiàn)被動語態(tài)。句意：——為什么湖水這么難聞？——因為大量的水被污染了。故選B

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