During the dinner we had (agreeable conversation)--(nothing extraordinary)--but (catching up) on recent events of (each other’s

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问题 During the dinner we had (agreeable conversation)--(nothing extraordinary)--but (catching up) on recent events of (each other’s life).

选项 A、agreeable conversation
B、nothing extraordinary
C、catching up
D、each other’s life

答案C

解析 在介词but之后,如果其前有动词do的某种形式,其后不定式一般不带to,反之则必须带to,表示“不得不,只能”。所以应将catching up改为to catch up。
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