语法词汇练习 语法大全 语法详解 英语听力 
I don’t know _____ he will be back home.        
#33403
A
who
B
what
C
when
D
where
下一题
推荐题目
I don’t know how long it’ll be　　　I get the bandage off my arm.
#30592
A
before　　
B
since
C
after
D
unless
We do not have enough money.________，we cannot afford to buy the new car.
#32754
A
However
B
Anyway
C
Therefore
D
Though
Who was it _______ wanted to see me just now?
#33118
A
whom
B
that
C
when
D
which
___ China’s reform（改革）and opening up in fate 1978, its quick development has aroused worldwide attention.
#34534
A
When
B
As
C
While
D
Since
Arrive late once more _____ you will be fired.
#30105
A
and
B
but
C
so
D
or