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