舌位前、低、嘴唇不圆的元音韵母是（）
A、o
B、e
C、a
D、u
参考答案：C
I _________ him for a long time .
A. didn’t seen B. haven’t seen C. will see
—Do you believe that difficult situations or hard experiences _______ the best qualities of a man?
—There is no doubt about that.
A．bring in
B．bring out
C．bring forward
D．bring up
