问题
选择题
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
答案：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”
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