One third of the class _____ agreed to be volunteers to help the aged this vocation.
A．a(chǎn)reB．isC．hasD．have
D
考查主謂一致。句意：這個(gè)假期這個(gè)班三分之一的學(xué)生同意作為志愿者幫助老年人。本句中class為集合名詞，表示復(fù)數(shù)含義，當(dāng)前面有分?jǐn)?shù)修飾時(shí)，后面謂語(yǔ)動(dòng)詞與名詞保持一致，故選D。
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