Not for a moment ______ that this disease was caused by certain virus.
| A．he have doubted | B．he doubts | C．did he doubt | D．he did doubt |
We have to delay the party till next week, ____ we will not have something important to do.
A. whenB. which C. at which D that
I don’t like such a person ____ often lies before your face.
| A．what | B．that | C．as | D．which |
By using ears one can tell the direction ____ a sound comes.
| A．in which | B．from which | C．with which | D．through which |
I don’t believe the reason ____ he has given for not coming to the lecture.
| A．why | B．that | C．how | D．what |
In the forest we observed some trees ____the leaves were black with disease.
| A．where | B．of which | C．in which | D．whose |