阿摩線上測驗
21. Twenty young talents, ________ had been trained locally, were invited to attend an international conference.
(A) all of them
(B) all of whom
(C) they all
(D) whom all
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統計： A(18), B(29), C(0), D(16), E(0) #1573224
統計： A(18), B(29), C(0), D(16), E(0) #1573224
