Never care, dear. Even ___ you started a bit earlier, the result would still not be quite different.

A．have

B．have had

C．had

D．had had

下颌后静脉（）。

A.由颞浅静脉与上颌静脉在腮腺内汇合而成

B.在颈外动脉的深面下行

C.自腮腺前缘穿出

D.后支与枕静脉汇合

E.前支注入颈外静脉