问题

New medicines and instruments ______ every day to extend life.
A:develop
B:are being developed
C:are developing
D:have developed
B:are being developed
C:are developing
D:have developed
正确答案是:
同类题型
The instructor’s life will improve instantly he ________ the parttime job.[ ]
was busy preparing a speech , only_______ once in a while to rise from the table for a tea
She has a lot of bad habits______.
Medicine shouldn’t be kept where it is _____ tochildren.
What do you think of the new movie——Wonderful! I’ve never seen ____________.