Many high schools ask their students to spend a certain number of hour _volunteering_ every day.

Many high schools ask their students to spend a certain number of hour _volunteering_ every day.
这是一道选正确形式填空,volunteering.但是我实在是看不懂为什么吖~
英语人气:650 ℃时间:2019-10-24 13:01:55
优质解答
sb.spend + 时间+(in)doing sth.某人花费时间做某事,是固定搭配
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