问题补充：
We have done what .So don’t panic any more.
A. is doing
B. has done
C. is done
D. can be done
答案：
A. is doing
B. has done
C. is done
(答案→)D. can be done
解析：原句意思是：能够做的我们已经做过了，因此不要再惊慌了。选项A. is doing正在做（主动语态）；B. has done已做了（现在完成时主动语态）C. is done被做（一般现在时被动语态）D. can be done能被做（含有情态动词的被动语态）。根据句意，故选D。
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