He decided not to attend her birthday party he had been invited..A. even ifB. because C.

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(答案→)A. even if
B. because
C. as if
D. as though
解析：这题考查连词的用法：even if即使，because 因为， as if， as though好像，句意是：他决定即使被邀请也不参加她的生日聚会。选A。