His mother looked very tired，for she _____ the house herself all day.
A．had cleanedB．has been cleaningC．had been cleaningD．has cleaned
C
考查完成進行時。根據(jù)關(guān)鍵詞all day可知應(yīng)該使用完成進行時。再根據(jù)上文的looked可知應(yīng)該使用過去完成進行時。
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