【題目】Three quarters of some children’s spare time wasted watching TV－that can explain why they are lazy.
A.are
B.is
C.being
D./

【答案】B
【解析】three quarters作主語時謂語動詞單復數(shù)取決于of后面的名詞的特征；時間time不可數(shù)，故以單數(shù)處理。句意：一些孩子課下三分之一的時間都浪費在看電視上，這可以解釋他們?yōu)槭裁磻卸�。根�?jù)句意，故選B。

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