2. 外语
  3. All (living) things are (made up of) one or more cells, and each of these cells (were) produced by an (already existing) cell.

All (living) things are (made up of) one or more cells, and each of these cells (were) produced by an (already existing) cell.

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问题 All (living) things are (made up of) one or more cells, and each of these cells (were) produced by an (already existing) cell.
选项 A、living
B、made up of
C、were
D、already existing
答案C
解析
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