高中英语主语从句综合单选题

thecity’spublicschoolsystemshouldbeopentothechildrenofmigrantworkershas become the focus of discussion.

A．That

B．If

C．What

D．Whether

__________knowledge comes from practice is known to all.

A．If

B．What

C．Where

D．That

______ surprised the hostess most is _______ one of her friends left the party without saying a word.

A．What, what

B．What, that

C．That, that

D．That, what

_______ parents say and do usually has a life-long effect on their children.  

A．That

B．Which

C．What

D．As

______ leaves the room last ought to make sure that the windows are closed and the door locked.

A．Whoever

B．Who

C．Who will

D．Those who

_____ the flight to New York will be delayed is ____ I'm especially worried about.

A．If; what

B．Whether; that

C．When; that

D．Whether; what

---Hi, Torry, can I use your computer for a while this afternoon?
----Sorry.________.

A．It’s repaired

B．It has been repaired

C．It’s being repaired

D．It had repaired