【单选题】
Before?he came to China, he??[填空]Chinese for three years.
①
have learned
②
had learned
③
learned
④
learning
【单选题】
____ nearly all behavior is learned behavior is a basic assumption of social scientists.
①
/
②
That
③
Itisacceptable
④
When
【单选题】
The receptionist receives a client. What is the chinese meaning of the client in the sentence?（ ）
①
顾客
②
代理
③
律师
④
法官