---What color_____ the cats?---I think ________white and black.
A:are ,they're
B:is ,it's
C:are ,it's
D:is,they're
A balanced diet provides ____(营养) for your body.
点拨:____ 表示"直到……为止"。
如:昨天晚上他一直到十点才睡觉。 ____
直到完成作业我才出去。 ____