当前位置：首页 >
综合英语（二）(00795) > 正文内容
The professor,（ ）whether anyone would come to help him, had to prepare for the experiment by himself.
The professor,（ ）whether anyone would come to help him, had to prepare for the experiment by himself.
A.
did not know
B.
having not known
C.
had not known
D.
not knowing
正确答案是D
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明：本文由翰林刷题小程序授权发布，如需转载请注明出处。