Yesterday he sold out all his stamps at ____ he thought was a reasonable price.
A. that
B. which
C. what
D. as
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Generally speaking, _______ we have seen seems more believable than _______ we have been told.
A. what, that
B. what, what
C. that, what
D. that, that
After three days’ waiting, there was a little doubt in the mother’s mind _______ the police could find her lost child.
A. how
B. that
C. where
D. whether
“Sustainable development” is a question _______ we can continue developing the world without damaging the environment.
A. why
B. when
C. that
D. how
My parents used ________they had to get a new car for my brother.
A. which
B. all what
C. what
D. \