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
How happy we _______, if you had come with us to the party. 
#89782
A
could be
B
may have been
C
would have been
D
were
He wasted a lot of time playing football, otherwise he ________the exam.
#90113
A
had passed
B
passed
C
would passed
D
would have passed