强调句选择 Is __ who helps with your math?A .it we B.that they C.

强调句选择 Is __ who helps with your math?A .it we B.that they C.it him D.it Mile 选什么?为什么?
( )Is __ who helps with your math?
A .it we B.that they C.it him D.it Mike
( ) it was__ she was ill __ she had to stay at home .
A.as……so B for……that C because……that D since……who