4.在较小的图形上绘制细点画线有困难时，可用细实线代替。
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In 2010 he caught a serious illness, from _effect he still suffers.
A. that
B. whose
C. which
D. what
In the dark street, there wasn't a single person_ she could turn for help.
A. that
B. who
C. from whom
D. to whom
On April first they flew to Beijing, _ they stayed several days.
A. where
B. when
C. which
D. there
Is this the school __you worked during the summer vacation?
A. that
B. which
C. when
D. in which
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