问题
选择题
Some of you have finished Book One. ________, you can go on with Book Two. [ ]
A. If you may
B. If you do
C. If not
D. If so
答案
答案：D
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Some of you have finished Book One. ________, you can go on with Book Two. [ ]
A. If you may
B. If you do
C. If not
D. If so
答案：D