Today William Shakespeare\_\_\_\_ the author of the plays credited to him, but some have suggested he couldn't have written them all.
Aassumes to be
Bis assumed to have been正確答案
Cto be assumed that
Dbeing assumed that
答案與詳解
被動語態正確。is assumed 表示「被認為」,to have been 為不定詞完美式,表示「過去曾經是」,符合莎士比亞為歷史人物的時態與語意。
