问题

This kind of CD-ROM is very popular. Why notbuy one before it________
A:comes out
B:is come out
C:sells out
D:is sold out
B:is come out
C:sells out
D:is sold out
正确答案是:
同类题型
______, I have to put the book away and focus my attention on study this weekend. [ ]
The number of the books in our school library _______ about50,000.
.How I wish every family _________ a large house with a beautiful garden.
_____ by some students,the teacher is telling some interesting stories[ ]