－I can’t find Mr.Smith.Where did you meet him this morning?－It was in the hotel _______ he st－It was in the hotel _______ he stayed.A that B which C the one D where为什么不选that?去掉It was that是He stayed in the hotel.句子也完整啊,为什么不能用强调句呢?

D

单独说 it was in the hotel that he stayed.
完全正确！
但是原题是：
－I can’t find Mr. Smith. Where did you meet him this morning? －It was in the hotel _______ he .....
所以，是省略了东西的句子，必须还原后再看。
答案是D

where指代前面的hotel，所以不能用that

这个就是强调句，只不过它不是完整的句子，完整句子如下：
It was in the hotel where he stayed (that I met him).
句子省略了与上文中重复的部分。

如多选that那么就应该是
It was the hotel that he stayed."that“这里是 “It was that”强调句的句式
而原题是 in the hotel...where he stayed 是hotel的定语从句 where 做stay的宾语 而that在定于从句中不能做成分
所以选D