Question

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

Answer 1

C

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”