问题补充:
6.--- Is there any possible way to help them get rid of such a bad habit?
--- To tell the truth, it’s very hard. But we teacherson this problem.
A. are working
B. had worked
C. worked
D. had been working
答案:
(答案→)A. are working
B. had worked
C. worked
D. had been working
解析:可联系答.案.网客服索取。