第二部分：英语知识运用
第一节：单项填空(每小题1分，共15分)
21. Just putting away the dishes, ________________.
A. the doorbell rang B. there went the doorbell
C. the doorbell heard to ring D. Nancy heard the doorbell ring
22.---Do you live in this city?
---No, we _____ it for holidays.
A. are just visiting B. just visited C. had already visited D. just visit
