问题
选择题
Only when ________ be possible to sign the papers.[ ]
A. does the boss come will it
B. the boss comes will it
C. has the boss come it will
D. the boss comes 
it will
答案
答案：B
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Only when ________ be possible to sign the papers.[ ]
A. does the boss come will it
B. the boss comes will it
C. has the boss come it will
D. the boss comes it will
答案：B