When I was trying to find out 1____1_ that prevented so many

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When I was trying to find out 1____1_ that prevented so many birds from returning to the north,
When I was trying to find out ____ that prevented so many birds from returning to the north, an unexpected visitor came. A. why it was B. what it did C. what it was D. why it did

C 这是一个It was ……that ……的强调句型

When I was trying to find out 1____1_ that prevented so many i was trying to find my way out when i suddenly heard some n 1.When I try to find out ______that prevents so many people They spoke so fast that I got rather ___(lose)trying to find when I try to understand___it is that prevents so many i'm trying to find a way out which is to find my new boss.这里 When I was a young boy,I was so shy that I dare not talk to Trying to find out your computer name... I suddenly realized that he was trying to _____ quarrelling i was surprised to find that When l workde along the street,I was surprised to find that 1、I suddenly realized that he was trying to ( )quarreling wi