问题描述：
1、when we travelled in Canada ,my cousin __________ as our guide .
为什么选served不选performed呢？
2、In modern times information technology ________ in our daily life .
为什么是plays an important part 不是 is playing an important part呢？
为什么选served不选performed呢？
2、In modern times information technology ________ in our daily life .
为什么是plays an important part 不是 is playing an important part呢？
问题解答：
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