The party was a success but we thought it a pity not you.A. to inviteB. to be invitingC.

问题补充：

The party was a success ,but we thought it a pity not you.

A. to invite

B. to be inviting

C. to have invited

D. to be invited

答案：

A. to invite

B. to be inviting

(答案→)C. to have invited

D. to be invited

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