to do sth与to doing sth的区别

It’s difficult to pin her down ______ a date for a meeting.

A. to fixing B. to fix

答案是 A，为什么不选 B 呢？

是的，答案要选 A。因为 pin sb down to doing sth 是惯用结构，表示迫使某人做某事，其中的to为介词，故其后接动名词。句意为：

It’s difficult to pin her down to fixing a date for a meeting. 让她确定个开会日期实在是难。

又如：

I managed to pin him down to meeting us after work. 我设法让他同意下班后和我们见面了。

若意思明确，有时可省略其中的动名词：

You’ll find it difficult to pin him down to (naming) a price. 到时候你就知道了，很难让他说出个准价。

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擅长：英语 | 采纳率 78% | 回答于 1秒前

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陈才 - 英语教师 1秒前

擅长：中考英语,词法问题

It’s difficult to pin her down to fixing a date for a meeting.

A. to fixing B. to fix

解答如下：为to介词，所有后面需要使用动名词

(1)pin sb down to sth/doing sth 使某人对某事/做某事做出承诺

I won't pin you down to a particular day; just come whenever you're free.

我不想让你定下确切的日子,你什么时候有空就过来。

If I can find the letter in which he promised to make a contribution,I'll pin him down to it.

如果我能找到他答应捐款的那封信,我一定要他履行诺言。

(2)pin sb down to doing sth 使某人对做某事做出承诺

The boss pinned Tom down to working for him for five years.

老板要汤姆作出为他工作5年的承诺。

黎反修 - 英语翻译（已退休） 1秒前

擅长：数词用法,存在句,英语考试

to do sth与to doing sth的区别: 前者的 to 动词不定式符号；后者的 to 是介词。