At 13，Samuel received a training course in drawing for three years，________ he got a good opportunity for further development.
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A
after that
B
after which
C
after it
D
after this
推荐题目
When deeply absorbed in work, _____ he often was, he would forget all about eating or sleeping.
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A
that
B
which
C
where
D
when
The growing speed of a plant is influenced by a number of factors, ________ are beyond our control.
#78648
A
most of them
B
most of which
C
most of what
D
most of that
Now everyone is concerned about how to conquer the economic crisis, __________is very important for us to preserve our standard of living．
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A
which success
B
its success
C
the success of which
D
the success of it
Mary was much kinder to Jack than she was to the others，______， of course, made all the others upset.(2011·北京)
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A
who
B
which
C
what
D
that