She look pale.She ( )ill A.can be  B.must be C.should be

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Shelookpale.She( )illA.can be  B.must be C.should beShelookpale.She( )illA.can be  B.must be C.shoul

She look pale.She ( )ill A.can be  B.must be C.should be
She look pale.She ( )ill A.can be  B.must be C.should be

She look pale.She ( )ill A.can be  B.must be C.should be
B.must be

must be 肯定
其他都是可能和应该