Young people tend to get up very late unless ________ to rise early.
A．requiredB．requiringC．they were requiredD．to require
A
考查非謂語(yǔ)動(dòng)詞。當(dāng)unless引導(dǎo)的狀語(yǔ)從句與主句主語(yǔ)一樣時(shí)，可以省略，用they are required，故選A。
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