He says all tried their best and that all that can be done been done.A. has hasB. have

问题补充：

He says all tried their best and that all that can be done been done.

A. has, has

B. have, have

C. have, has

D. has, have

答案：

A. has, has

B. have, have

(答案→)C. have, has

D. has, have

解析：all 做主语时，表示物谓语用单数，表示人谓语用复数，

“他说所有的人都尽力了，所有能做的事都做了”