All of the flowers now raised here have developed from those ___in the forest.
A. once they grew
B. they grew once
C. they once grew
D. that once grew
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_______ is mentioned above, the number of the students in senior schools is increasing.
A. Which
B. As
C. That
D. It
He was very rude to the Customs officer, ______ of course made things even worse.
A. who
B. whom
C. what
D. which
Dorothy was always speaking highly of her role in the play, ________,of course , made the others unhappy.
A. who
B. which
C. this
D. what
The result of the experiment was very good, ______ we hadn’t expected.
A. when
B. that
C. which
D. what