The boy the first prize, but he was so careless as to make a foolish mistake.
#87720
A
must have gained
B
need have gained
C
could have gained
D
shall have gained
推荐题目
I wrote a letter to John for his help during my high school years，without which I ________ the college entrance exam.
#86497
A
would fail
B
would have failed
C
should fail
D
must have failed
Swimming alone ____ be ____ dangerous. Do be careful.
#89464
A
need, highly
B
may, high
C
can; highly
D
can; high
Watch out for these animals! They could be terrified ______ a sudden loud noise．
#87225
A
being there
B
should there be
C
there was
D
there have been
If he my advice, he wouldn’t have lost his job.
#87793
A
followed
B
should follow
C
had followed
D
would follow