選擇題Is this research center the one foregin guest

題目：

選擇題Is this research center the one foregin guest
Is this research center the one foregin guests visited last week?
A.that
B.which
C.where
D.the one
選了A,答案是D,想問問爲什麼

解答：

改寫成陳述句爲This research center is the one foreign guests visited last week.
缺少表語充當先行詞.因此that不行.