Have you ever seen any trees ________ leaves were black because of the polluted air?
#66808
A
whose
B
that
C
which
D
who
推荐题目
I had reached a point in my career _____ I needed to decide which way to go．
#71490
A
why
B
which
C
when
D
where
—______ bargaining is always such great fun?—Usually people consider it a test to see who can stand their ground longer.
#66908
A
What is it that
B
Why is it that
C
What it is that
D
Why it is that
The fact has worried many scientists _____ the earth is becoming warmer and warmer these years.
#68141
A
which
B
that
C
as
D
what
Along with the letter was his promise _______ he would visit me this coming Christmas.
#72541
A
which
B
that
C
what
D
whether