they built a new laboratory in their schoollast menth改被动语态
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they built a new laboratory in their schoollast menth改被动语态
they built a new laboratory in their schoollast menth改被动语态
they built a new laboratory in their schoollast menth改被动语态
a new laboratory was built in their schoollast menth by them
A new laboratory was built in their schoollast menth.
A new laboratory was built in their schoollast menth by them.
a new laboratory have been built in their school last month.
原句应该是 they built a new laboratory in their school last month
a new laboratory was built by them in their school last month
a new laboratory was built by them in their school last month