I wouldn’t think itto ask him tothe club—he’ll only refuse.A. worthwhile;joinB. worthwhile

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(答案→)A. worthwhile;join
B. worthwhile;join in
C. worthy;join
D. worthy;join in
解析：worthwhile意为“值得做的”；worth意为“有价值的，有意义的”；join表示“加入”；join in意为“参加（某活动）”。