问题描述：
You can do ()you want yo do.
A.when
B.what
C.why
D.thing
A nice post office is()you.
a.in front of
b.behind
c.round
d.next
A.when
B.what
C.why
D.thing
A nice post office is()you.
a.in front of
b.behind
c.round
d.next
问题解答：
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