rfid第二版课后答案:一道选择体

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The education system some specialists were opposed__B_ a complete failure,__ the dapartment concerned with so many problems to solve
A.to being proved,just to leave B.to proved,leaving
C.to was proved,leaving D.proved,having left

为什么选这个?

be opposed to do
用进行时表伴随状况

A。