问题
选择题
After the class，the students went out of the classroom one by one, but only Mary______.
A．left
B．hadleft
C．wasleaving
D．wasleft
答案
答案：D
leave既可作"离开"解，又可作"留下"解。本题明显含有"Mary被留在教室 里 (by the teacher)"之意。
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