Question

_________ you take an active part in physical activity ______ be able to keep fit and stay healthy.

A．Only if; you will	B．Only if; will you
C．Unless; you will	D．Unless; will you

Answer 1

B

试题分析：考查倒装句：句意：只有你积极的参加体育活动，你才能保持健康。Only后面接状语从句的时候，主句应该用部分倒装，助动词will放在主语前面，选B。