good manners to say “Sorry” when you knock into someone but    no need to say it again and again .
A．There are ; there isB．It is ; there isC．There is ; it is D．It is ; it is
B
第一空it為形式主語，it代指的是真正的主語to say sorry when you knock into someone,形式主語只能選擇it，第二空是固定句型，there is no need to do sth 意為，沒有必要干某事
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