问题
选择题
Scientists still wonder whether cloning will help or harm us and where it ____ us.
A．has led
B．is leading
C．had led
D．would lead
答案
答案：B
考查时态。Lead的现在进行时表将来。句意：科学家想知道克隆对人类有害还是有益它要引领我们去何方？
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