( )you eat the correct foods ( ) be able to keep fit and stay healthy.

问题描述:

( )you eat the correct foods ( ) be able to keep fit and stay healthy.
A Only if ; will you.B Only if ; you will
C Unless ; will you D Unless; you will
嗯,请问Unless如果在句首的话是不也得需要倒装?还有为什么不能够用unless的呢?

选A,只要你合理用餐,就能保持体形和健康.是条件句
如果用unless的话,意思就变了,就变成:除非你合理用餐,不然你的体形与健康就被保持了.
unless是可以后面接倒装的,但在这里意思变了,如果非要有unless的话,后面的be之前要加个not