阿摩線上測驗
4. _______ , most stem cell studies use mouse embryos. but human in vitro embryo cells are sometimes used.
(A) Yet to date
(B) As of to date
(C) As today
(D) To date
(E) To day
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統計： A(11), B(1), C(13), D(24), E(1) #3084000
統計： A(11), B(1), C(13), D(24), E(1) #3084000
