I can’t see my old grandmother________alone in the country，so I’ll have her________with me in the city.

A．leave；staying

B．leaving；to stay

C．left；stay

D．left；stayed

某些苗木感病后，植物体内的生长激素类物质常常失调，引发植物产生（）症状。

A.腐朽

B.腐烂

C.坏死

D.畸形