Something ___ to save our earth. Do you think so?
#88938
A
can do
B
must do
C
has to do
D
must be done
推荐题目
___________, he would have been fired. 
#88131
A
Had he lied to the boss
B
Did he lie to the boss
C
If he has lied to the boss
D
If he lies to the boss
I insisted that a doctor ________ immediately.
#86728
A
has been sent for
B
sends for
C
be sent for
D
will be sent for