1、of
be careful of 小心,注意；當心…,對…仔細
2、enter
后面有信息詞【and sit】
see sb do sth強調(diào)【動作全過程】.enter是及物動詞,后面可以直接接賓語.
1.you should be more careful _your study(of /for)選什么為什么
1.you should be more careful _your study(of /for)選什么為什么
2.i saw bill___the room quietly and sit behind the door(enter/entering/come/enter into)
2.i saw bill___the room quietly and sit behind the door(enter/entering/come/enter into)
英語人氣：606 ℃時間：2019-10-19 16:07:22
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