单项选择题
A．as, thrown B．for, thrown C．since, throwing D．as, throwing
An investigation was made into the accident, （）five peo...
单项选择题An investigation was made into the accident, （）five people were killed.
A．where B．for that C．when D．in which
Long before children are able to speak a language, （）co...
单项选择题Long before children are able to speak a language, （）communicate through facial expressions and by making noises.
A．however B．they C．furthermore D．who
