"She has not seen her friends ______ a long time." A."for" B."since" Answer and Feedback Answer:A do you want? view more test Xem thêm Share this post Some other questions you may be interested in. A: How are you doing? B: I’m doing __________. How are you? I’m __________. You should concentrate __________ the teacher says. When Europeans arrived in __________ America, there were only Indians there. __________ has recently been done to improve the service, we still get a lot of complaints about it. Sometimes parents want their children to do __________ they cannot do themselves. We were not aware __________ was going on. Contrary _________ we had expected, he didn't try his best. Manners are just a formal expression of __________ you treat people. I wonder ______ soon the letter will reach him.