单项选择题

To tell you the truth, it’ s very hard for us to help them get rid of Internet addiction. But we ______ on this problem trying to improve the situation.

A) worked
B) had worked
C) are working
D) had been working
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单项选择题
A．He is interested in his work.B．He is proud of his work.C．He is tired of his work.D．He is keen on his work.
A．He is interested in his work.
B．He is proud of his work.
C．He is tired of his work.
D．He is keen on his work.
单项选择题
A．Wife and husband.B．Teacher and student.C．Clerk and guest.D．Employer and employee.
A．Wife and husband.
B．Teacher and student.
C．Clerk and guest.
D．Employer and employee.
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