____ be careful when crossing the street!
#85481
A
Must
B
Should
C
Ought to
D
Do
推荐题目
I can’t quite remember ________ you started playing golf.   
#85129
A
when it was that
B
when was it that
C
that it was when
D
that was it when
It was Jane_____ I saw in the library this morning.
#84841
A
that
B
which
C
what
D
when
.It was _____ his mother came in _____ to prepare his lessons. 
#85386
A
not until; did the boy begin
B
until; that the boy didn’t begin
C
until; did the boy not begin
D
not until; that the boy began