21. ___________ for the bus, _________ fell out of his pocket.
(A)Running, John’s cell phone
(B)Ran, his cell phone
(C)As John was running, his cell phone
(D)When he is running, John’s cell phone
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統計: A(22), B(4), C(70), D(9), E(0) #485499
統計: A(22), B(4), C(70), D(9), E(0) #485499