Scientists say it still needs five or six years _____ it is possible for human p

Scientists say it still needs five or six years _____ it is possible for human p

题型:北京市期末题难度:来源:
Scientists say it still needs five or six years _____ it is possible for human patients to take this medicine. [     ]
A. since
B. before
C. after
D. when
答案
B
举一反三
—It"s a long story, but there are not any new words in it.
—Good! _______ it will be hard for children. [     ]
A. So
B. Or
C. But
D. And
题型:北京市期末题难度:| 查看答案
I haven"t heard from Bill _____ he left here. [     ]
A. when
B. before
C. since
D. while
题型:江苏省期末题难度:| 查看答案
Mr Smith usually reads a newspaper _____ he"s waiting for the bus. [     ]
A. if
B. then
C. because
D. while
题型:江苏省期末题难度:| 查看答案
—Please wait here . I"ll come back soon. 
—All right. We"ll stay at the library ______  you come back. [     ]
A. until
B. for
C. while
D. as
题型:天津市期末题难度:| 查看答案
Someone called me at midnight, but he hung up _____ I could answer it. [     ]
A. as
B. since
C. after
D. before
题型:天津模拟题难度:| 查看答案
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