I __________get on the bus when I heard someone calling me from behind.

A．was to

B．was going to

C．would

D．was about to

龄对疾病发生的影响（）

A.无影响

B.仅对非传染病发生有影响

C.仅对传染病发生有影响

D.影响不明显

E.对传染病和非传染病发生均有影响