问题
选择题
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
答案
答案：B
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