作业指导书应当( )，不引起歧义。
A．简洁
B．明了
C．美观
D．实用
参考答案：A,B,C,D
-- Hi, Samantha! When did you arrive in Leeds?
--- Last week, I ___________ a different culture since then.
A．was experiencing
B．will be experiencing
C．have been experiencing
D．had been experiencing
著作权与商标权区别
