Many people think they have to spend a lot of money to keep healthy. Leading a healthy lifestyle doesn't have to cost much, .
A. though
B. too
C. somehow
D. either
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(答案→)A. though
B. too
C. somehow
D. either
解析：考查副词辨析。句意：许多人认为他们要想保持健康就不得不花很多钱。但是，过一种健康的生活方式不必花费很多。though常放句尾，前用逗号与句子隔开，意为“但是”。故选A。