(2013·高考新课标全国卷Ⅱ)Since nobody gave him any help,he________have done the research on his own.
#62474
A
can       
B
must
C
would
D
need
推荐题目
Our playground is not so tidy and beautiful as before, students must ____ dirty things on it.  
#74989
A
be stopped to throw
B
be stopped throwing
C
stop to throw
D
stop from throwing
— May I park my car here, Sir?  —_________. You may park it over there.
#74702
A
Yes, you may
B
Yes, you can
C
No, you needn't
D
No, you mustn't