"You‘re going to have a test next week.Learn all these words.""All right.I______them by then." (2 分)
问题描述：
"You‘re going to have a test next week.Learn all these words.""All right.I______them by then." (2 分)
A.shall learn
B.shall be learning
C.shall have learned
D.have learned
答
C shall have done 将来完成时,表示将来某时间已经完成某事.（到那时我会已经记下所有的单词了.)其实介词by是个很好的提示：by now 常用于现在完成时：have/has done； eg:I have saved 100 dollars by now.by then ...