-I play high-temperature Yoga in the gym every Sunday. -Good habit, but the air in the gym is bad ________.A.to be breathedB.to breatheC.breathingD.being breathed
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B解析本题考查非谓语动词。breathe和air之间虽然是动宾关系，但在主系表结构中,当表语形容词为good, light,heavy, difficult等时,其后常用不定式作状语,表示时间,原因,结果等,且常用主动形式表示被动意义。