问题
选择题
A huge amount of oil was on the road, the effects of are not clear．
A．it
B．that
C．which
D．whom
答案
答案：C
考查定语从句。先行词为A huge amount of oil，它的影响故用the effects of which，句意：大量的石油即将来临，它的影响还不清楚。故选C。
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