— Could we practice playing the guitar in the hall, Sir ? —No , ___________ you have the principal’s (校长) note.
#55372
A
if
B
unless
C
because
D
since
推荐题目
Hurry up. The car is coming. Wait a minute, Don’t cross the street _____the traffic lights are green.
#56861
A
while
B
when
C
until
D
after
