We saw some children playing basketball before ___ (enter) t

We saw some children playing basketball before ___ (enter) teh room.
答案是entering .

aa爱莲人 1年前已收到4个回答举报

caiken2000 幼苗

共回答了26个问题采纳率：96.2% 举报

efore 有两个词性
当它后面接句子时,是连词.如 Please tell me before you arrive.
当它后面接词或词组时,是介词.介词的一个特点是：后接动词时,要用动名词形式.
本题：before后接词组,是介词.所以,答案是entering
希望我的回答能够帮到你,

1年前

hnsnow 幼苗

共回答了1个问题举报

before 在这是介词，enter是动词，动词放在介词后面当然要用动名词（V-ing）的形式咯。

1年前

linglong2008 幼苗

共回答了5个问题举报

这里的before理解为一个介词，介词后接动名词形式。

1年前

iice20703 幼苗

共回答了1个问题举报

before是介词，介词不能在句子中独立充当成分，其后必须有一个名词、名词性短语或从句做它的宾语，而enter是动词，再此需要变成动名词entering（动名词属于名词）。

1年前

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