问题描述：
( )-_______ will you finish your college?
-In a year.
A.How soon B.How long C.How often D.How old
( )He ______ to sing English songs when he was only six years
old.
A.can B.was able to C.is able to D.able to
-In a year.
A.How soon B.How long C.How often D.How old
( )He ______ to sing English songs when he was only six years
old.
A.can B.was able to C.is able to D.able to
问题解答：
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