we promise continuous increase in rural ines improve the whole people's well-being.
A. Only if; we can
B. If only; can we
C. Only if; can we
D. Unless; we can
网友回答
A. Only if; we can
B. If only; can we
(答案→)C. Only if; can we
D. Unless; we can
解析:句意:只有我们承诺不断地增加农村地区人们的收入,我们才能够提高整个人们的幸福感。Only if只有,位于句首时主句要部分倒装。If only要是…该多好啊!故选C.