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

There is something wrong with my DVD player. I’ll have it ____________.

Do you have to say about your family

e the students understand the problemthe teacher tried to explain it, but the explanation just did not _________tothe class

Have you looked _____ today’s newspaper—Yes, I have been looking for someinformation about tomorrow’s weather.

The stranger to walk into the building in the early morning was probably a salesman.