l do volunteer work by spending every saturday ---cleaners clean the city park.a\helpingb\to helpc\watchingd\to watch答案是a为什么

l do volunteer work by spending every saturday ---cleaners clean the city park.a\helpingb\to helpc\watchingd\to watch答案是a为什么
l do volunteer work by spending every saturday ---cleaners clean the city park.
a\helping
b\to help
c\watching
d\to watch
答案是a为什么

l do volunteer work by spending every saturday ---cleaners clean the city park.a\helpingb\to helpc\watchingd\to watch答案是a为什么
A
spend sometime doing sth.排除BC
肯定是帮助环卫工打扫而不是待在一边看 排除C
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spend doing固定搭配