摘要： ---Which is more useful, biology or chemistry? ---I think them are useful. A. either of B. none of C. both of D. all of
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---Which is more useful, chemistry or biology?
---I think _____ them are useful.
- A.none of
- B.all of
- C.either of
- D.both of
--Which is more useful, chemistry or biology?
--I think _____ them are useful.
[ ]
|
A ．none of |
B ．all of |
|
C ．either of |
D ．both of |