1. That is the reason _____ he gave us for carrying out the plan.

A. because　　　 B. why　　 C. when　　 D. which

10．This/ The day is _______ we/I stayed in Beijing last year.

A. what　　　 B. that /which　　 C. where　　 D. when

答案：1．C 　2．C 　3．B　 　4．A 　5．B 　6．C 　7．D 　8．B 　9．A 　10．D

9．This day is ______ we spent together last year.

8．This is the day ______ we spent together last year.

7．This is the day ______ we/I visited the modern equipment last year.

6．This/The research center is _____ we/I paid a visit last year.

5．This is the research center _____ we/I paid a visit to last year.

4．This research center is ______ we/I visited last year.

3．This is the research center ______ we/I visited last year.

2．This research center is ______ we/I visited the modern equipment last year.