单项选择题
Do you have any idea why he （） ？
A.is looked sad B.is looking sad C.looks sadly D.looks sad
单项选择题 JustasIwasleavingthehouse，itoccurred（）methatIhadforgottenmykeys.
单项选择题 Aprofessor，alongwithsomestudents，（）nowworkinginthenewlaboratory.
单项选择题 Smithregretted（）tothemeetingyesterday.
