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--- My dad bought me a new MP4 player, but I don’t know 　　　.
#40910
A
what to use
B
what to use it
C
how to use it
D
when to use it
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---___you ___the window?—Yes, I am.
#41024
A
Do, clean
B
Is, cleaning
C
Are, cleaning
D
Do, cleaning
What is the best way __________ the question?
#41101
A
answer
B
answering
C
to answer
D
to answering
—          do you like it?     —It is fantastic.
#40826
A
How
B
What
C
Where
D
When
—__________ do I have to change the robot’s batteries? —Every two months.
#41136
A
How long
B
How soon
C
How often
D
How many
The two dresses are very nice. I can’t decide _________。
#40944
A
which one should I buy
B
which one to buy
C
which one I to buy
D
which I bought one