问题
6．— Is there any possible way to help them get rid of such a bad habit? — To tell the truth, it’s very hardBut we teachers________on this problem
A:are working
B:had worked
C:worked
D:had been working
B:had worked
C:worked
D:had been working
正确答案是：
同类题型
Mum, Bill is coming to dinner thisevening. —Ok, Let’s give him _________ to eat.
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Having worked for as long as ten hours, the young man lay on the ground, _____.
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