Whoisithavethemostimportantrol

Who is it______have the most important role to play in stopping Yellow River erosion?
A,who B.that C.which D.whom

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— Dare you go swimming in the sea ? — No , ____ .

A．I dare not

B．don''t dare

C．don''t dare go

D．I am afraid

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— Who dares to go ? How about you ? — Sorry , I ____ .

A．dare not to go

B．don''t dare to

C．don''t dare

D．dare not to

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It''s nearly seven o''clock . Jack ____ . be here at any moment .

A．must

B．need

C．should

D．can

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Johny , you ____ play with the knife , you ____ hurt yourself .

A．won''t ; can''t

B．mustn''t ; may

C．shouldn''t ; must

D．can''t ; shouldn''t

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— ____ he be at home now ?
— No . he ____ not . He ____ be in his office . He often goes home from work at almost twelve .

A．Can ; can ; must

B．Must ; need ; can

C．May ; must ; must

D．May ; need ; must

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