I was doing my homework ____ a dog came in.[     ]A. when    B. while    C. as  

I was doing my homework ____ a dog came in.[     ]A. when    B. while    C. as  

题型:同步题难度:来源:
I was doing my homework ____ a dog came in.[     ]
A. when    
B. while    
C. as    
D. at
答案
A
举一反三
I left my umbrella in my room. Could you wait _____ I go back to get it? [     ]
A. if
B. before
C. while
题型:同步题难度:| 查看答案
—Please write here. I"ll come back soon.
—All right. We won"t leave ______ you come back.[     ]
A. since
B. until
C. while
题型:同步题难度:| 查看答案
I hope to go to France some day _____ there are many famous art museums.     [     ]
A. when
B. if
C. because
D. whose
题型:同步题难度:| 查看答案
I hope to go to France some day ____  there are many famous art museums.     [     ]
A. when
B. if
C. because
D. whose
题型:同步题难度:| 查看答案
—I"m going to Hangzhou for a holiday this weekend.
—____ you are there, can you buy me some green tea?

[     ]

A. Because
B. If
C. While
D. After
题型:同步题难度:| 查看答案
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