If ____, the dirty air will lead you to fall ill.
A．breathe inB．you to breathe in C．breathing inD．breathed in
D
考查非謂語動(dòng)詞。句意：如果被吸入，這些臟空氣會(huì)導(dǎo)致你生病。過去分詞表示被動(dòng)的動(dòng)作和句子主語是動(dòng)賓關(guān)系，結(jié)合語境可知選D。
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