28.A: What _______?B: They are playing with the dog.(A) they doing(B) they are do(C) are they do(D)

問題詳情

28.A: What _______?B: They are playing with the dog.
(A) they doing
(B) they are do
(C) are they do
(D) are they doing

答案：D
難度：計算中-1
書單：沒有書單，新增

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