good manners to say “Sorry” when you kn...

good manners to say “Sorry” when you knock into someone but no need to say it again and again .

A．There are ; there is

B．It is ; there is

C．There is ; it is

D．It is ; it is

B 【解析】第一空it为形式主语，it代指的是真正的主语to say sorry when you knock into someone,形式主语只能选择it，第二空是固定句型，there is no need to do sth 意为，没有必要干某事

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