问题

The researchers found clear and convincing evidence _______ happiness is the key when it comes to better health and longer lives.

A:where
B:whether
C:how
D:that

正确答案是：

同类题型

I drove to Zhuhai for the air show last week—Is that ________ you had a few days off

We waited and waited until the wind ____________ and then we started with our trip again.

While our city tries impatiently to change its appearance by tearing down old buildings, more and more citizens are suggesting ways to ____ the historically important architecture．

You look so tired. Why not _______a rest

ws shocked the public, to great concem aboutstudents’ safety at school.