Swimming alone ____ be ____ dangerous. Do be careful.
#89464
A
need, highly
B
may, high
C
can; highly
D
can; high
推荐题目
 —Why didn’t you attend the lecture yesterday?—I didn’t think that we _______ on Sundays.
#90145
A
should
B
ought to have
C
shouldn’t have
D
will have to
 The headmaster demanded all the teachers ______ in the office.
#86783
A
mustn’t smoke
B
did smoke
C
should smoke
D
not smoke