分类：教育/科学-学习帮助
问题：单项选择9.
9. --- _________ is the meeting going to last?
-- about twenty minutes.
a. what time b. how soon c. how long d. how far
回答：9. --- _________ is the meeting going to last?
-- about twenty minutes.
 c. how long 

a. what time问的是具体时间
b. how soon问的是多久（以后） 
c. how long问的是多长时间
d. how far问的是多远