--1.You can centainly leave the classroom as soon as your work__?
A had done B has been done C will be done D had been done
--2.A new bridge__near our town right now.
A is to be built B will be built C is built
D is being built
--3.That dictionary__to you.
A is not belonged B don't belong C is not belong
D doesn't belong

--1.You can centainly leave the classroom as soon as your work__?
B has been done
当你的工作一做完，你当然可以离开教室。
因为主语用将来时，从句用现在时就够，而不是C的将来时。

--2.A new bridge__near our town right now.
D is being built
在我们镇旁边正在建一座新桥。
正在建，用现在进行时，桥被建，用被动。

--3.That dictionary__to you.
D doesn't belong
那本字典不属于你。
belong不及物动词，不能用被动，A C不对。
第三人称单数，选D。