He doesn't know ____ next.在how to do,what to do it,when to d

He doesn't know next 1how to do 2what to do next 3how to do he doesn't know how to do next（改错） He didn't know what to do next.He didn't know what he ____ _ （ ）He doesn't know ( ).A.what to do.B.what he can do .C.how 20. He doesn't know ______ A. when to do B. what to do C. ho He doesn't know__next.A,how to do;B,what to do it;C,where to He doesn't know ---A what to do B how to do 选那个,为什么, Mary feally doesn't know __about it.A.what to do B.how to do He doesn't know what to do next.里面的what to do可不可以等于what shou She doesn't know how to do this ____ 中文翻译:When he doesn't know how to do his homework. i don't know how to do next还是what to do next