A huge amount of oil was spilt on the East Sea, the causes of ______ are still under investigation.
#78658
A
it
B
that
C
which
D
whom
推荐题目
In our class there are 73 students, ____ half wear glasses.
#78610
A
in whom
B
of them
C
in them
D
of whom
I have bought two ball pens, _____ writes well.
#78692
A
none of them
B
neither of them
C
none of which
D
neither of which
He didn’t attend the meeting last night, _________ he doesn’t know our plan for the picnic. 
#78674
A
that’s why
B
that’s because
C
which is why
D
which is because