题目内容
Researchers have come to the conclusion over the last 5 years ________ teens need to sleep until about 8∶00 the next morning.
[ ]
A.
when
B.
what
C.
whether
D.
that
答案:D
练习册系列答案
相关题目
题目内容
Researchers have come to the conclusion over the last 5 years ________ teens need to sleep until about 8∶00 the next morning.
when
what
whether
that