matters most is they can finish the task on time.A. That; ifB. What; whatC. That; that .D

问题补充：

matters most is they can finish the task on time.

A. That; if

B. What; what

C. That; that .

D. What; whether

答案：

A. That; if

B. What; what

C. That; that .

(答案→)D. What; whether

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