No one ________ tell ________ new use we can make of the machine.
A.may; how
B.can; which
C.could; what
D.needs to; if
网友回答
C解析情态动词can与tell连用表示“知道，了解”，相当于know，一般用于疑问句和否定句，如I cannot tell. Who can tell where he's from?后一空用what引导宾语从句，what在从句中作定语修饰名词use，what use在从句中作宾语。