We find ________ more useful for students to do new eye exercises.（ ）
| A． |
it |
B． |
this |
C． |
one |
D． |
that |
We find ________ more useful for students to do new eye exercises.（ ）
| A． |
it |
B． |
this |
C． |
one |
D． |
that |
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