问题
选择题
— You look very pale. You ____ very tired.
— I didn't sleep at all last night. [ ]
A. must be
B. must have been
C. can be
D. can have been
答案
答案：A
搜题请搜索小程序“爱下问搜题”
— You look very pale. You ____ very tired.
— I didn't sleep at all last night. [ ]
A. must be
B. must have been
C. can be
D. can have been
答案：A