问题
选择题
He looks very tired . He ____ to bed too late last night .
A.must go
B.must have gone
C.could go
D.didn''t go
答案
B。
must 用于表示推测时,只能用于肯定句,完成式表示对过去情况的推测。
He looks very tired . He ____ to bed too late last night .
A.must go
B.must have gone
C.could go
D.didn''t go
B。
must 用于表示推测时,只能用于肯定句,完成式表示对过去情况的推测。