请选择DCBA7_/h3i.i7M All _________ has already been done.'E(r4B5@:[7b-W*Q3r5j-l4n
A.can be done'E(r4B5@:[7b-W*Q3r5j-l4n
B.should be done'E(r4B5@:[7b-W*Q3r5j-l4n
C.that can be done'E(r4B5@:[7b-W*Q3r5j-l4n
D.what should be done Grammar and Vocabulary'E(r4B5@:[7b-W*Q3r5j-l4n