问题
选择题
We must take measures to protect endangered wildlife _______ it is too late.
A．now that
B．as long as
C．unless
D．before
答案
答案：D
本题易误选C。后空意思“趁不太晚的时候”，before符合句意。
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We must take measures to protect endangered wildlife _______ it is too late.
A．now that
B．as long as
C．unless
D．before
答案：D
本题易误选C。后空意思“趁不太晚的时候”，before符合句意。