题目内容
(请给出正确答案)
[主观题]
Iwasgivingatalktoalargegroupofpeople,thesametalkI______tohalfadozenothergroupsbefore.
A.wasgiving
B.amgiving
C.hadgiven
D.havegiven
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A.wasgiving
B.amgiving
C.hadgiven
D.havegiven