单项选择题
Send your questions to Mary Adams,（） is the director of Public Relations,for a quick reply.
A.who B.which C.whom D.that
单项选择题 Our Accounts Receivable Department has written to you three times;（）,we have had no response to our letters.
单项选择题 （）in the labor market,he has enrolled in a computer course.
单项选择题 Information about the current foreign markets （） very important to our company.
