04-10-31

Statistics indicate that approximate every 22 years--within a range of 3 to 4 years--a major

drought occurs in the United States.

答案A  B为什么不用approximately？

是A

B中的approximate是修饰22 years的，做TOEFL肯定是要挑错得最明显的那个,A是绝对不成立的.