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19．He must be from Africa, ____ can be seen from his skin.

A．that 　 B．a(chǎn)s　　 C．who　 D．what

18． ____ , the compass was first made in China.

A．It is known to all　　 B．It is known that　 C．We know all　　 D．As is known to all

17．I, ____ your good friend, will try my best to help you out. 　

A．who is　 　B．who am　　　 C．that is　　　 D．what is

16．Each time ____ they met they would talked long hours together. 　

A．which 　 B．during　　 C．when　 D．不填

15．I'll tell you ____ he told me last week.

A．a(chǎn)ll which 　 B．a(chǎn)ll what　　　　 C．that all　 D．a(chǎn)ll

14．Who ____ has common sense will do such a thing?　

A．which 　 B．who　 C．whom　 D．that

13．Have you seen the girl ____ ?　

A．that I told　　　 B．I told you of　　　 C．whom I told you　　 D．I told you of him

12．The radio set ____ has gone wrong.

A．I bought it last week　　　 B．Which I bought it last week

C．I bought last week　　　　 D．What I bought last week

11．Didn't you see the man ____ ?　

A．I nodded just now　　　　　　 B．Whom I nodded just now

C．I nodded to him just now　　　 D．I nodded to just now

10．She heard a terrible noise, ____ brought her heart into her mouth.

A．it 　 B．which　　 C．this　　 D．That