Its late.I know A. it B. so C. that D/ 答案选D。为何不写it
I know 和 I know it 都可以,虽然不需要it的状况更多一些。此题不够严谨。
《韦氏高阶》:
I know
1—used to express agreement
“Hurry up, were going to be late.” “I know, but I cant find my shoe.”
“This place is such a mess.” “I know it.” [=I agree]
“I cant believe he lied.” “I know, I know.”
“The whole situation is just so stupid.” “I know.”