问题
选择题
Not until _____,_______the diffiult problem.[ ]
A.did he return;we settled
B.he returned;we settled
C.did he return,did we settle
D.he returned;did we settle.
答案
答案：D
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Not until _____,_______the diffiult problem.[ ]
A.did he return;we settled
B.he returned;we settled
C.did he return,did we settle
D.he returned;did we settle.
答案：D