题目内容
How this kind of plant can be ____ in a special way is still unknown to us.
- A.kept away
- B.kept out
- C.kept alive
- D.kept off
C
keep alive意为:使…活着; keep away意为:使…离开; keep out意为:不使入内,防止; keep off意为:不让接近.
keep alive意为:使…活着; keep away意为:使…离开; keep out意为:不使入内,防止; keep off意为:不让接近.
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