I think it's going to be a big problem.yes,it would be.I wonder ( )we can do about it.A.if B.how C.what D.that

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I think it's going to be a big problem.yes,it would be.I wonder ( )we can do about it.A.if B.how C.what D.that

I think it's going to be a big problem.yes,it would be.I wonder ( )we can do about it.A.if B.how C.what D.that
I think it's going to be a big problem.yes,it would be.I wonder ( )we can do about it.
A.if B.how C.what D.that

I think it's going to be a big problem.yes,it would be.I wonder ( )we can do about it.A.if B.how C.what D.that
A