He find his book this morning,but now he---his penA.loses B.has lost 请教一下这边为何选has lost,为什么不用一般现在时,不是丢了的笔找不到了吗?

He has not found his book/He have not find his book.分析下这两句 He is taking his book.He can take his book. He is taking his book He can take his book He's _____ his book,but he I can't_____it.A,finding,look for B,Look for,find C,find,look for he helped me___ my lost book.(find) he was__________(surprise)to find the book. the boy___(look)for his English book everywherebut he didn't find it用looked还是had looked,还是都行? He is taking his book 翻译 He occupied his whole afternoon reading book He will find his shortcomings sooner _________later He can't find his keys a______ Tim is_______ his book everywhere,but he can ’ t _____ it.A.looking at; findB.looking for; find C.finding; look forD.looking for; see 英语翻译POLLUTION IS ONE MOST SERIOUS ______(PROBLEM) IN THE WORLD KIM______(LOUD) HIS LIBRARY BOOK LAST WEEK ,HE COULDNT FIND IT解释为什么这么填 he lost his book 和he have lose his book具体区别是什么 He lost his book.如何变一般现在时He lost his book.如何变一般现在时 英语翻译He is taking his book He can take his book where he (find) his lost dogwhere he (find) his lost dog 填空 He can find my book.(变一般疑问句）