阿摩線上測驗
20. Enrly__________ , human embtyos form a structure called the blastocyst.
(A) in developing
(B) developing
(C) in development
(D) development
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統計： A(1), B(2), C(6), D(1), E(0) #3024600
統計： A(1), B(2), C(6), D(1), E(0) #3024600
