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