The teacher was worried about the boys in her class, for they spent time playing computer

The teacher was worried about the boys in her class, for they spent time playing computer games.
A. large amount of
B. a large number of
C. a large amount of
D. large numbers of

A. large amount ofB. a large number of(答案→)C. a large amount ofD. large numbers of解析：考查固定短语。 句义：老师担心那些男孩子，因为他们花费了大量的时间用来玩电脑游戏。A. large amount of 短语不对B. a large number of +复数名词 C. a large amount of+ 不可数名词D. large numbers of+复数名词，根据宾语是time不可数，所以C正确。

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