问题补充:
— Where is John? — He in the library.
A. should be
B. must be
C. can be
D. must have been
答案:
A. should be
(答案→)B. must be
C. can be
D. must have been
解析: must do表示对现在的事实进行推测。
时间:2020-01-13 12:11:59
— Where is John? — He in the library.
A. should be
B. must be
C. can be
D. must have been
A. should be
(答案→)B. must be
C. can be
D. must have been
解析: must do表示对现在的事实进行推测。