Do you have any idea _____ is actually going on in the classroom? [ ]A. t

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Do you have any idea _____ is actually  going on in the classroom?   [     ]
A. that
B. what
C. as
D. which

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举一反三

— Is there any  possibility _____ you could pick me up at the airport?
— No problem.
A. when
B. that
C. whether
D. what

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There is no obvious evidence  ____ there  is life on any other planet in the solar system.
A. which
B. that
C. how
D. where

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The fact has worried many scientists ____ the earth is becoming warmer and warmer these years.
A. what
B. which
C. that
D. though

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Mr Smith asked the boy a question _____ he could go to the  concert with him.
A. whether
B. that
C. what
D. if

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Tomorrow is Tom"s birthday.  Have you got any idea ____ the party is to be held? [     ]
A. what
B. which
C. that
D. where

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