Daniel is one of those students who _______ always willing to help others .
A．isB．a(chǎn)reC．wasD．were
B
B 考查定語(yǔ)從句。先行詞為those students是復(fù)數(shù)形式，故定語(yǔ)從句的謂語(yǔ)用復(fù)數(shù)，排除A、C。主句是一般現(xiàn)在時(shí)，故排除D。
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