_____will mr lin come back?in about half an hour.a.how far b.how often c.how soon
问题描述：
_____will mr lin come back?in about half an hour.a.how far b.how often c.how soon
答
选C
a,how far=多远
b,how often=多频繁
c,how soon=多快,多久
题目回答“大约半个小时内”,故C