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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