because they _____ the before.(see) 填什么,为什么

because they _____ the before.(see) 填什么,为什么 求 because they _____ the before.(see) 填什么,为什么 we're lucky to see the sharks because they're ususlly s 首字母填 ____ they read the book before?参考答案填Have,那么填How long did 为什么 Because I can see the sea,and I never see it before. they saw _____ girls the day before yesterday. I can see _____ old man sitting on the chair .横线上应该填什么? did they see the aliens （play）football just now 应该填什么形式 11.The children look excited because they _____ already ____ They made him _____captain of the ship. 填什么?为什么? My sister _____ (not read)this book before 填什么 They _____ went to see the doctor ____.