the house Mr.Li has been broken into ?A. When was it thatB. When hasC. HasD. had

问题补充：

the house Mr.Li has been broken into ?

A. When was it that

B. When has

C. Has

D. had

答案：

A. When was it that

B. When has

(答案→)C. Has

D. had

解析：Mr.Li has为定语从句，主句是Has the house been broken into ?