As a science lover, I hope I can invent a bike ________ can fly in the sky.
| A． |
where |
B． |
when |
C． |
which |
D． |
who |
As a science lover, I hope I can invent a bike ________ can fly in the sky.
| A． |
where |
B． |
when |
C． |
which |
D． |
who |
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