(2014·辽宁五校第一联合体考试)What impresses me most is________he appears in front of others，he wears a sincere and charming smile.
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A
what
B
which
C
that where
D
that whenever
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________ your son is well again, you no longer have anything to worry about.
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A
If
B
when
C
Now that
D
As soon as
22．Lawrence Craven, a doctor from the USA，is the author of several published reports, one of______ introduced the idea in 1953 ______aspirin could reduce the risk of heart attacks．
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A
them; when
B
which; that
C
what; that
D
which; when
You can only be sure of_________ you have at present; you cannot be sure of something _____ you might get in the future.
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A
that; what
B
which; that
C
/; that
D
what; /
Although the old lady has a daughter and two sons ,______ live with her．
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A
none of whom
B
neither of them
C
all of whom
D
none of them