—Has William finished writing his graduation paper yet??
—I don’t know exactly，but he __________all day.?
A．is writingB．has been writing?
C．was writingD．wrote
B?
表示“一整天都在做某事(此時(shí)該動作還沒有結(jié)束)”要用現(xiàn)在完成進(jìn)行時(shí)。?
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