By the time all the gifts were opened,the atmosphere_____ to calm down.
A.began
B.begins
C.has gegun
D.is beginning
正确答案是：
人气：224 ℃ 时间：2019-08-21 16:28:04
解答
正确答案是：A
分析题目:考察时态的前后一致
分析解释一下四个选项：都是开始的意思,只有A用的是一般过去时,与were相对应
全句的意思是：当所有的礼物都被打开后,气氛才开始平静下来.
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