15.The professor insisted that we ___ our papers on Monday.A.handed in B.will hand in C.hand in st hand in26.The river is dangerous for children ____.A.swimming B.swimming it swim swim in當然要的不是僅是最后答案，我想知道為什么這么選，請大家講解的詳細些，謝謝大家。

熱心網友

15題選C原因是insist（堅持，執(zhí)意）這樣的詞帶有虛擬語氣，后面的動詞必須是原形。26題選D原因是be dangerous for sb to do sth.在河里游泳，是swim in the river

熱心網友

c insist 后接虛擬語氣should +動詞原形,should可以省略。D 固定句型be+ adj.+(for sb.) to do sth. 在河里游泳用in

熱心網友

15.Theprofessorinsistedthatwe___ourpapersonMonday.A.handedinB.willhandinC.handinsthandin選c,在insist引導的從句中常用should+動詞原形的虛擬語氣,且should可以省略,所以這里用原形;26.Theriverisdangerousforchildren____.A.swimmingB.swimmingitswimswimin選d, do做定語toswim和theriver之間有動賓關系,因為是在河里游泳,故選擇swimin。

熱心網友

sist后跟shoulddosth.答案中should省略 his+ rsbtodosth,固定表達。不選c因此swim是不及物動詞,表示在河里游泳要加介詞in