We should be careful while using body language in foreign countries(改为同义句)

问题描述:

We should be careful while using body language in foreign countries(改为同义句)
We should____body language in foreign countries

正确答案是:pay attention to using
pay attention to (doing) sth 小心(做)某事
其中的to是介词,而不是不定式符号,所以其后加名词、代词或动名词,而不是动词原形.