He is very sick. I insist that a doctor __________ immediately.
#102576
A
has been sent for
B
sends for
C
will be sent for
D
be sent for
推荐题目
Tim ____since he lost his job three weeks ago.
#101002
A
had been unemployed
B
was unemployed
C
has been unemployed
D
has unemployed
___________two tickets for the new play at the Grand Theatre on Saturday. Shall we go and see it together?
#101140
A
They have been given
B
I have been given
C
I am given
D
They have given to me
If we _________ now to protect the environment, we’ll live to regret it. 
#100580
A
hadn’t acted
B
haven’t acted
C
don’t act
D
won’t act