抗战后期，日军同国民党军队在正面战场进行的规模最大的一次战役是（）。
A.徐州会战
B.淞沪会战
C.枣宜会战
D.豫湘桂战役
参考答案：D
There has been an increase in the technical cooperation and cultural__________between China and other
countries in the past ten years.[ ]
A．change
B．trade
C．bargain
D．exchange
— I phoned you at 7 yesterday evening but nobody answered.
— Oh, I _______my dog in the park then.
A．walked
B．was walking
C．had walked
D．would walk
