The boy found a wallet in the street, and then he ...... to return it to the loser.
A. tried
B. had tried
C. was trying
D. had been trying
Giải bởi Vietjack
Đáp án: A
Giải thích: Cậu bé tìm thấy một chiếc ví trên đường, và sau đó anh ta cố gắng trả lại cho người thua cuộc.
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