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【单选题】
They were surprised that a child should work out the problem ________ they themselves couldn't.
They were surprised that a child should work out the problem ________ they themselves couldn't.
A.
once
B.
then
C.
While
D.
if
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参考解析：
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【单选题】—Has Mr.Tom White arrived ?---- Yes ,already ．______he wait outside or just come in ?—Has Mr.Tom White arrived ?---- Yes ,already . ______he wait outside or just come in ?
A.
Shall
B.
May
C.
Could
D.
Must
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A.
no matter who
B.
whoever
C.
no matter whom
D.
whomever
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A.
wounded
B.
ruined
C.
injured
D.
harmed
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A.
come up with
B.
keep up with
C.
grow up with
D.
put up with
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A.
precise
B.
efficient
C.
guilty
D.
evident
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A.
who
B.
it
C.
which
D.
that
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A.
intend
B.
predict
C.
arrange
D.
Promise
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A.
was working
B.
has been working
C.
worked
D.
had been working