The old man often looked back on the past days ________ he worked hard to make a living.
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A
which
B
when
C
where
D
that
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She was so angry at all ______ I was doing ______ she walked out.
#74233
A
that; which
B
that; that
C
which; that
D
which; as to
Although he was in poor health, Robert succeeded ______ other more famous engineers failed.
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A
which
B
that
C
what
D
where
The great scientist became world-known in the early 1970s,______ he and another scientist made new discoveries about black holes.
#73597
A
which
B
where
C
when
D
then