The most versatile______embryonic stem cells, which______found in the embryo at the earliest stage of development and grow into

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问题 The most versatile______embryonic stem cells, which______found in the embryo at the earliest stage of development and grow into any part of the body.

选项 A、is: is
B、are: are
C、are: is
D、is: are

答案B

解析 句意:最全能的是胚胎干细胞,胚胎干细胞在胚胎发育的早期就能被发现,并长成身体的任何部分。主语embryonic stem cells是复数,形容词versatile和定语从句均修饰主语,故两个空都填复数形式are。
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