问题

By the time he retires, professor Baker _____ foralmost forty years．

A:will havetaught
B:had taught
C:has taught
D:is teaching

正确答案是：

同类题型

There _______ lots of bad news on the Internet for children.

It is _______ of the students to stay up reading till late night before the final exam.

All the students shouted when they heard such_______ exciting news.

I am wondering ________________________.

Mum, you really need to have a rest! You in the kitchen ever since you came back home three hours ago