题目内容
(请给出正确答案)
[单选题]
Scarcely ______ down when ______ a knock at the door. A.had he sat; did he hear B.he had s
A.A.had he sat; did he hear
B.B.he had sat; did he hear
C.C.he had sat; he heard
D.D.had he sat; he heard
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