—Why are you looking so tired?—I B the school yard.A.have cleaned B.Have been cleaningC.cleaned D.Was cleaning那个B 是同学说的 但是我感觉好像不对 所以问下

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—Why are you looking so tired?—I B the school yard.A.have cleaned B.Have been cleaningC.cleaned D.Was cleaning那个B 是同学说的 但是我感觉好像不对 所以问下
—Why are you looking so tired?
—I B the school yard.
A.have cleaned B.Have been cleaning
C.cleaned D.Was cleaning
那个B 是同学说的 但是我感觉好像不对 所以问下

—Why are you looking so tired?—I B the school yard.A.have cleaned B.Have been cleaningC.cleaned D.Was cleaning那个B 是同学说的 但是我感觉好像不对 所以问下
A,现在完成时

c

B
我一直在做这件事,所以很累!

have been cleaning
-你为什么看上去很累?
-我一直在打扫操场.
这里是强调动作一直没停,一直在打扫.

A过去发生的事情对现在的影响,用现在完成时