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Which of the following sentences doesn't contain(包含)an object clause?

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．

I don't know ________ up so early last Sunday．

A．why did he get

B．why he gets

C．why does he get

D．why he got

Do you know ________?

A．what the news are

B．what is the news

C．what the news is

D．what are the news

I want to know how long ________．

A．has he been back

B．has he come back

C．he has been back

D．he has come back

Could you tell me ________?

A．where do you live

B．who you are waiting for

C．who were you waiting for

D．where you live in

Could you tell me ________?

A．when will they leave Beijing

B．when would they leave Beijing

C．when they will leave Beijing

D．when did they leave Beijing

She didn't know ________．

A．who he was looking after

B．who was he looking for

C．who he is looking for

D．who he is looking after

You must remember ________．

A．what your mother said

B．what did your mother say

C．your mother said what

D．what has your mother said

She asked me if I knew ________．

A．whose pen is it

B．whose pen it was

C．whose pen it is

D．whose pen was it

Please tell me ________ last year．

A．where does your sister work

B．where did your sister work

C．where your sister works

D．where your sister worked