is up to us to give them all the help we can.A. That; thatB. What ; whatC. It whatD. I

问题补充：

is up to us to give them all the help we can.

A. That; that

B. What ; what

C. It , what

D. It, /

答案：

A. That; that

B. What ; what

C. It , what

(答案→)D. It, /

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