用于宫内异物取出（）
A. * * 镜
B.宫腔镜
C.腹腔镜
D.B型超声
E.诊断性刮宫
参考答案：B
As you know, although there are no classes on weekends now, no students ________ go out of school
without the headteacher's permission.[ ]
A. will
B. must
C. may
D. shall
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