He ____ the letter from his brother when I ____ the room.
A.was reading; was entering
B.read; entered
C.was reading; entered
D. reading; entering
出自：国家开放大学英语语法
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He ____ the letter from his brother when I ____ the room.
A.was reading; was entering
B.read; entered
C.was reading; entered
D. reading; entering
出自：国家开放大学英语语法