说明理由
问题描述：
说明理由
1.No one tells us ______,so we need your help.
A.how we should do B.what should we do C.how to do it D.what to do it
2.He ______ the club and ______ its activities.
A.took part in ； joined B.joined； took part in C.joined； took a part in
D.took part in； took part in
答
1.正确答案选C.是疑问词+to do 在句中作宾语.选项A若改为 how we should do it 就正确了.因为宾语从句要用陈述句语序.do后要有宾语.选项B语序不正确,因为宾语从句要用陈述句语序,改为what we should do 就正确了.此...