Have you ever seen any trees leaves were black because of the polluted air?A. whoseB. th

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。