题干
I heard that it is _________ more and more popular to celebrate Father's Day in China.
A：becoming
B：became
C：become
D：becomes
答案(点此获取答案解析）
A
I heard that it is _________ more and more popular to celebrate Father's Day in China.
A：becoming
B：became
C：become
D：becomes
CO2+H2，达平衡后测得CO2为0.75 mol再通入6 mol水蒸气，达到新的平衡后，CO2和H2的物质的量之和可能为