阿摩線上測驗
8. Every student is expected to be _______ his best behavior on Speech Day.
(A) on
(B) in
(C) with
(D) at
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統計： A(1), B(0), C(0), D(0), E(0) #3355085
統計： A(1), B(0), C(0), D(0), E(0) #3355085
