When___(build)our new school library hasn't decided yet.He was told that the exhibition_____(hold)the next week.

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When___(build)our new school library hasn't decided yet.He was told that the exhibition_____(hold)the next week.

When___(build)our new school library hasn't decided yet.He was told that the exhibition_____(hold)the next week.
When___(build)our new school library hasn't decide
d yet.
He was told that the exhibition_____(hold)the next week.

When___(build)our new school library hasn't decided yet.He was told that the exhibition_____(hold)the next week.
1 When TO BUILD (build)our new school library hasn't been decided yet
--------when + 动词不定式 做主语

2 He was told that the exhibition WOULD BE HELD (hold)the next week.
---------主句是过去式+ 从句部分(以後要发生的事情,谓语动词是过去将来时)

原因已经解释了,呵呵.