UC知道Have not you seen the notice"No photos___"? I am sorry ,i ___.
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A is allowed taking , did not notice B is allowed to take , was not noticing
答案是B，谁能说明为什么
答案是B，谁能说明为什么
B
首先,is allowed to do sth 是正确用法
其次,一般会觉得was not noticing 别扭,但这是强调在刚才那个时间没有注意到,是对过去的动作的描述,所以用过去进行时态.
B
一定是be allowed to do被允许做某事。did not notice 和was not noticing 都可以。
1. allow to do sth 被动就是be allowed to do
2. 我刚才没注意到（言外之意，现在注意到了），刚才没注意，是一瞬间的事情。所以用ing
B is allowed to do sth 是正确用法
感觉都不大对
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