题目内容：

-- tom do you know if sam --- to my party next week -- l think she will come if she --- free
a\ comees ; will be
b\ will come ; is
c\ comes is
d\ will come ; will be
请说明理由好吗?

优质解答

B因为：do you know if sam --- to my party 你知道sam明天会来我的生日晚会吗,if 引导宾语从句,表示：“是否”,“他是否会来”要用 “if sam will comeshe will come if she --- free.意思是：“如果她有时间,她会...