一道英语语法题？

Question

What's that newly-built building?
_____the students have out-of-activities,such as drawing and singing.
A It is the building that B That's where
答案是B 为什么不能选A强调句呢

Answer 1

答案：A
解释：这里是及物动词hide的过去分词，表示句子的主语I（我）是过去分词hidden的承受者。非谓语形式。完整的句子是：As I was hidden behind the door,I wasn't found by the fellow.
翻译：由于我藏在门后面，我没有被那家伙发现。
提示：过去分词作状语，句子的主语是分词动作的承受者；现在分词作状语，句子的主语是分词动作的执行者。
例如：Waiting for a bus,I saw Jack.句子的主语I(我)是现在分词waiting的执行者。“等公交车的时候，我看见了杰克。”这个句子等于“While I was waiting for a bus,I saw Jack.”
学习要点：英语中这几个词必须弄清楚：seat,hide,lose,dress,他们的句型是：seat oneself ,hide oneself ,lose oneself,dress oneself.
帮助理解：I seatd myself.=I was seated. I hid myself behide the door.=I was hidden behind the door. I lost myself in the forest.=I was lost in the forest. I dressd myself in red.=I was dressed in red.
延伸理解：As she was dressed in red,she could easily be found.=Dressed in red,she could easily be found.句子的主语she是dress动作的承受者。As she was dressed in red,=As she dressd herself in red,。

Answer 2

选A的话，整个句子也不是个强调句啊。强调句中，that必须充当一定句子成分，是不能省略的。如果将A填进去，变成it is the building that the students have ……，that 无法充当任何成分。正确的形式应该是it is the building in which……，这里的In which其实就相当于where了，因为指代的是地点。

Answer 3

如果选择A，正如你说的只能是理解为强调句，但问题是它并不能被看成是一个强调句。一般强调句把it is（was）和that拿掉，句子应该可以还原成一个陈述句。可这句话中的the building却无法在句中充当成分。而选择B，where 引起一个表语从句。正好能回答上面问句。追答

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Answer 4

这个选B，因为前面具体问了that building是做什么的，所以后面正是对这个句子的回答，相对于A来说，B更直接易懂。

Answer 5

students have activities in the building. A选项少了一个介词in，所以只能用where