问题
选择题
Having an English class, _____.[ ]
A. we heard someone knock at the door
B. someone knocked at the door
C. we heard someone knocked at the door
D. the door was opened
答案
答案：A
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Having an English class, _____.[ ]
A. we heard someone knock at the door
B. someone knocked at the door
C. we heard someone knocked at the door
D. the door was opened
答案：A