Scientists are now working _ humanoids(类
题型:选择题
问题:
Scientists are now working _ humanoids(类人生物) because they can help people a lot. [ ]
A. on
B. against
C. into
D. to
Scientists are now working _ humanoids(类人生物) because they can help people a lot. [ ]
A. on
B. against
C. into
D. to