来自刘俊民的问题
wemustcleanourteethbefore什么(go)tobed
wemustcleanourteethbefore什么(go)tobed
1回答
2020-08-31 23:14
wemustcleanourteethbefore什么(go)tobed
wemustcleanourteethbefore什么(go)tobed
填going,因为before是介词,介词后跟v-ing形式作宾语.