Scientists are now working _ humanoids(类人生物) because they can help people alot. [ ]A. onB. against C

题目简介

Scientists are now working _ humanoids(类人生物) because they can help people alot. [ ]A. onB. against C

题目详情

Scientists are now working _        humanoids(类人生物) because they can help people a    lot.        
[     ]
A. on                
B. against        
C. into          
D. to
题型:单选题难度:中档来源:同步题

答案

A

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