问题

tired professor, _____ in his new book in thepast three years, hasn’t realized the decline in his health.

A:involved
B:being involved
C:having involved
D:to beinvolved

正确答案是：

同类题型

The kids were very happy as they could get tickets .

He asked us to __________him __________carrying through their plan.

Mom, when shall we go to Weifang Museum this weekend—Oh, sorry. I’m going to Beijing for a meeting. ____ Saturday ____ Sunday is OK.

It is already well understood causesthe global warming

Only when he apologizes for his rudeness ____to him again.