6 下の[ ]から適切な語句を1回ずつ選んで下線部に入れ, 対話文を完成させなさい。
Jim: I saw Jack downtown. (1) He
Ann: (2) You
can
must
have become a bad boy.
be joking. He's doing well in school.
be a bad boy.
Jim: That doesn't matter. (3) Anybody
Ann: (4) Like you
might
Jim: What are you talking about?
used to
be.
[ must/ used to / can / might ]