—I can never forget the day ___ we spent together in the summer camp．—Well, especially the day _______it suddenly began to rain in the middle of the night．
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A
when; when
B
which; when
C
what; that
D
on which; when
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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