16. Mike was shy, but he stepped out of his _______ zone to make a speech in front of 500 people.
(A) balance
(B) comfort
(C) horizon
(D) outcome
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統計: A(18), B(430), C(20), D(17), E(0) #2556022
統計: A(18), B(430), C(20), D(17), E(0) #2556022