It was only in the eighteenth century__people in Europe began to think that mountains were beautifuA.when B.which C.that D.in which
问题描述：
It was only in the eighteenth century__people in Europe began to think that mountains were beautifu
A.when B.which C.that D.in which
答
选C
这是一个强调句,因为去掉It was ...that ...后是一个完整句子.
还原得：People in Europe began to think that mountains were beautifu only in the eighteenth century.