By the end of the last month, I _____________ all the CDs of Justin Bieber.
#41903
A
collect
B
collected
C
have collected
D
had collected
推荐题目
What ________ if there ______ no water or air on the earth?
#39823
A
happen, is
B
will happen, is
C
will happen, will be
D
happen ,are
—      you      your dictionary yet?—Yes, I        , I        it ten minutes ago. 
#39226
A
Did; find; did; found
B
Have; found; have; found
C
Have; found; did; found
D
Have; found; have; find