We still cannot persuade him to give up smoking ____ hard we tried.
A．soB．howC．thoughD．however
D
本題考查however引導(dǎo)的讓步狀語(yǔ)從句。however引導(dǎo)的讓步狀語(yǔ)從句后面直接接形容詞或副詞。so和though則不可以。
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