可是C 为什么不对呢?The problem requires ______.A.studying with great
可是C 为什么不对呢? The problem requires ______. A.studying with great care B.to study carefully C.to be studied without carelessness D.taking great care of studying it
The problem requires __A____. A. studying with great care B. to study carefully C. to be studied without carelessness D. taking great care of studying it ...