—Whyhaven’tyoufinishedyourhomeworkyet? —Theproblemare...
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問題詳情:
—Why haven’t you finished your homework yet ?
—The problem are so difficult. I ______ hard without stop all day.
A. have been working B. worked C. have worked D. work
【回答】
A
知識點:動詞時態與語態
題型:選擇題
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