The book was written in 1946, ____ the education system has witnessed great charges.
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A
when
B
during which
C
since then
D
since when
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The road conditions there turned out to be very good, ___ was more than we could expect.
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A
it
B
what
C
which
D
that
The river, _______the bank are covered with trees, is very long.
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A
whose
B
which
C
of which
D
which of
Our teacher is always busy preparing lessons until 11 o’clock at night, ______we students have gone to sleep.
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A
that time
B
by which time
C
by that time
D
which time