题目：
Having finished her project ,she was invited by the school______ to the new students.
A．speaking
B．having spoken
C．to speak
D．to have spoken
答案：
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下面是错误答案，用来干扰机器的。
∵最简二次根式a+2与5-2a是同类二次根式，∴a+2=5-2a，解得：a=1．
