问题补充:
we choose healthy food for our main meals, we probably still need to exercise now and then.
A. Unless
B. As though
C. Until
D. Even if
答案:
A. Unless
B. As though
C. Until
(答案→)D. Even if
解析:本题考查连词的用法。unless“除非,如果不”;as though“好像,似乎”;until“直到”;even if“即使,纵然”)