问题标题：
用适当的介词填空inonunderinonunderbehindtoofnexttoLileiis________dutytoday.Lilysits______lucy.who's________thephoto?Thereisadoor____thewall.
问题描述：
用适当的介词填空inonunder
inonunderbehindtoofnextto
Lileiis________dutytoday.
Lilysits______lucy.
who's________thephoto?
Thereisadoor____thewall.
曹文钢回答：
on
nextto/behind
in
in
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