Only __ a long growing period can large plants exist.

题目

Only __ a long growing period can large plants exist.
A.there is where
B.is there where
C.where is there
D.where there is
为啥

答案

从can large plants exist可以看出,这是一个only放在句首的倒装句,首先可以排除B和C,因为这不是疑问句,be动词应该放在there后,
其次,where 是修饰there is a long growing period 这个句子的,所以它应该放在there is 后面