what are you so excited ,john?our class got frist prize in the singing contest at last ,which we___forward to .A have been looking B had been lookingC lookedD had look

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what are you so excited ,john?our class got frist prize in the singing contest at last ,which we___forward to .
A have been looking
B had been looking
C looked
D had look

A 因为是一直想得到的意思 所以用现在完成进行时表达动作一直持续到现在