20.----Look at what you are doing! ----- Ah, I wonder this boot won’t fit me. I’ve been trying to put it on the wrong foot. A. how B. if C. why D. that 【查看更多】

 

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—Look at what you are doing!

—Ah, I wonder ________ this boot won't fit me. I've been trying to put it on the wrong foot.

[  ]

A.how
B.if
C.why
D.that

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