______ is well known ______ Hong Kong returned to China on July 1st,1997.A.It,that B.As,/ C______ is well known ______ Hong Kong returned to China on July 1st,1997.A.It,that B.As,/ C.As,as D.It,which

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______iswellknown______HongKongreturnedtoChinaonJuly1st,1997.A.It,thatB.As,/C______iswellknown______

______ is well known ______ Hong Kong returned to China on July 1st,1997.A.It,that B.As,/ C______ is well known ______ Hong Kong returned to China on July 1st,1997.A.It,that B.As,/ C.As,as D.It,which
______ is well known ______ Hong Kong returned to China on July 1st,1997.A.It,that B.As,/ C
______ is well known ______ Hong Kong returned to China on July 1st,1997.
A.It,that B.As,/ C.As,as D.It,which

______ is well known ______ Hong Kong returned to China on July 1st,1997.A.It,that B.As,/ C______ is well known ______ Hong Kong returned to China on July 1st,1997.A.It,that B.As,/ C.As,as D.It,which
______ is well known ______ Hong Kong returned to China on July 1st,1997.
A.It,that B.As,/ C.As,as D.It,which
选项是A.
It是形式主语.that引导主语从句.
请点击下面的“选为满意答案”按钮,

A.It is well known that 众所周知。。。。。。

选A,
主语从句

A。
It是指Hong Kong returned to China on July 1st,1997,就是形式主语。
B的话As引导非限定性定语从句,这里要用As的话known后边要逗号
CD明显不对
要用that呦。