问题

It was difficult to tell exactly _______ the saying began, but it is possible that it was in the theatre or movie industry

A:where
B:when
C:why
D:that

正确答案是：

同类题型

To finish the task, we’ve tried three times, and after dinner we’ll try _________ time.

______ the students in our school go to college intheir teens.

Mrs. Smith often goes to visit those AIDS patients in hospitals to cheer up.

We laugh at jokes，but seldom____________about how they work．

It _______ them three years to build this road.