阿摩線上測驗
16. But accomplishing all this social learning without in-person interactions is difficult, _____
impossible, under quarantine.
(A) if
(B) if not
(C) if only
(D) as if
答案：登入後查看
統計： A(11), B(53), C(34), D(68), E(0) #3053657
統計： A(11), B(53), C(34), D(68), E(0) #3053657
