Which of the following sentences doesn’t contain(包含) an object clause（宾语从句）?
#38136
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 the next Olympic Games will be held in Beijing.
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It keeps raining these days. We doubt _______ the sports meeting will take place as planned.
#79123
A
which
B
that
C
whether
D
when
People in Yancheng are proud of ________ they have achieved in the past thirty years.
#37793
A
how
B
which
C
what
D
when
Alice has gone to the classroom and she didn’t say ________.
#38026
A
when did she come back
B
when would she be back
C
when she came back
D
when she would be back