Making robots is one of ________ activities among students. Each of them has his own robot.
| A． |
more popular |
B． |
the most popular |
C． |
more difficult |
D． |
the most difficult |
Making robots is one of ________ activities among students. Each of them has his own robot.
| A． |
more popular |
B． |
the most popular |
C． |
more difficult |
D． |
the most difficult |
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