问题补充:
Have you ever seen any trees leaves were black because of the polluted air?
A. whose
B. that
C. which
D. who
答案:
(答案→)A. whose
B. that
C. which
D. who
解析:A考查定语从句。句意:你见过由于空气污染而叶子变黑的树吗?空处引导定语从句修饰先行词trees,并在从句中作leaves的定语,故用whose。
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