2. 外语
  3. The most versatile ______ embryonic stem cells, which ______ found in the embryo at the earliest stage of development and can gr

The most versatile ______ embryonic stem cells, which ______ found in the embryo at the earliest stage of development and can gr

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问题 The most versatile ______ embryonic stem cells, which ______ found in the embryo at the earliest stage of development and can grow into any part of the body.
选项 A、are, are
B、is, is
C、are, is
D、is, are
答案A
解析
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