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
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Every time Ashtita tries to break a record, he reaches a point ______ he feels he cannot physically do any more．
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A
where
B
that
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when
D
which
I admire my English teacher. I can remember very few occasions ________ she stopped working because of ill health.
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A
that
B
when
C
where
D
which
The air quality in the city, ________is shown in the report, has improved over the past two months.
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A
that
B
it
C
as
D
what