问题
选择题
It_________five or ten years before the new medicine is tested on human beings. [ ]
A. will take
B. took
C. takes
D. has taken
答案
答案：A
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It_________five or ten years before the new medicine is tested on human beings. [ ]
A. will take
B. took
C. takes
D. has taken
答案：A
he boy is free,he often goes bike r_________.