Although the teacher had told Bob the history of telephone, Bob didn’t know when ____. 
#37382
A
it was invent
B
was it invented
C
it was invented
D
it invented
推荐题目
— What did your father ask you just now? — He asked me     .
#37385
A
when do I come back
B
whom I was chatting with
C
where would I go with my friend
D
if I will finish my homework
We don’t know ______, maybe in the afternoon.
#37715
A
why will we start
B
how we will start it
C
when we will start
D
where we will go
Lots of people are wondering ________.
#38301
A
how long does it take to rebuild the destroyed areas
B
that China will win the first place in the next Olympic Games
C
when a Chinese woman can walk in space
D
how soon Taiwan will return back to motherland