Which of the following sentences doesn’t contain(包含) an object clause?
#37448
A
Many people believe robots will do most of our work.
B
Scientists should be able to develop plants that grow on Mars.
C
People think that humans on Mars have to wear special boots to make themselves heavier.
D
We all know the29th Olympic Games was held in Beijing.
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I wonder _________Eddie has gone to Singapore.
#38923
A
how long
B
how often
C
when
D
if
 –Do you know ______ the Capital Museum? –Next Friday.
#39392
A
when will they visit
B
when they will visit
C
when did they visit
D
when they visited
--Tell me ____________. ---Well, it’s like … 
#37827
A
what is wrong with it
B
what is it
C
what the matter is with it
D
what is it like