Ithinkstudentsshouldgotoschoolontime,butsomeofthemare

问题详情：

I think students should go to school on time, but some of them are ____late.

      A. by the time     B. on time      C. from time to time   D. in times

【回答】

C

知识点：介词和介词短语

题型：选择题