There are some birds _____ in the sky.

A. flying
B. to fly
C. flew
D. are flying
相關習題

科目:初中英語 來源:期中題 題型:單選題

There are some birds _____ in the sky.
[     ]
A. flying
B. to fly
C. flew
D. are flying

查看答案和解析>>


同步練習冊答案