问题

Mary _________ as a volunteer teacher for 10years.
A:works
B: willwork
C:worked
D: has worked
B: willwork
C:worked
D: has worked
正确答案是:
同类题型
The man in the red car __________ hisfather.— Yes. I think so.
The clock has three hands _________
The new exchange students don’t seem whofor help.
It is not surprising the new course on electronic games has attracted many students.
There is no experience you can have is more exciting than skating on real ice