They are talking they were old friends.A. as ifB. as althoughC. even ifD. even though

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(答案→)A. as if
B. as although
C. even if
D. even though
解析：考查连词：A.as if好像B.as although这是错误的表达，C.even if即使D.even though即使，他们在谈论好像他们是老朋友。选A。