It’s difficult to what the long-term effects of the accident will be.A. calculateB. forec

问题补充：

It’s difficult to what the long-term effects of the accident will be.

A. calculate

B. forecast

C. guess

D. form

答案：

A. calculate

(答案→)B. forecast

C. guess

D. form

解析：动词辨析。A计算；B预测；C猜想；D形成；句意：要预测这次事故的长期影响是很困难的。根据句意说明B正确。