问题
选择题
— Who____ it be that is knocking at the door?
— It ____ be Father, but I'm not sure. [ ]
A. can; must
B. can; may
C. must; can
D. may; must
答案
答案：B
搜题请搜索小程序“爱下问搜题”
— Who____ it be that is knocking at the door?
— It ____ be Father, but I'm not sure. [ ]
A. can; must
B. can; may
C. must; can
D. may; must
答案：B
