People live longer and stay __ today than they did 50 years ago.
A．healthB．healthierC．healthiestD．the healthiest
B
本題中含有比較結(jié)構(gòu)than，故要用比較級(jí)，stay是連系動(dòng)詞，后應(yīng)跟形容詞healthy的比較級(jí)healthier，故選B。
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