．The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
#34793
A
what
B
which
C
that
D
though
推荐题目
It was in the small house ___ was built with stones by his father ___he spent his childhood .
#32725
A
which , that
B
that , where
C
which , which
D
that , which
______ you are supposed to do ______ you don't like a thing is ______ it. Don't complain.
#29993
A
That; what; change
B
When; that; to change
C
What; when;to change
D
What; that; changing
Faye’s fondest memory is of last year, ______ the club gave a tea party for her birthday.
#33445
A
that
B
which
C
where
D
when
The researchers found clear and convincing evidence _________ happiness is the key when it comes to better health and longer lives.
#30504
A
where
B
whether
C
how
D
that