Our class recently has had a heated discussion about if the historic old buildings should be tear down. Opinions varies from one to another. Some students support the protection of those buildings so they are carriers of history through which the future generations can deep understand the development of our city. Beside, the historic old buildings can also arouse people’s love for the city.

In the contrary, some other students think that the old buildings may hold back the development of economy and the process of modernization. It may affect the beauty of the city.

As far I’m concerned, I approve of（赞成） the former opinion. But if a building is worth of little, it may be proper to demolish(摧毁) it and make better use of that area. We should just weight the advantages and disadvantages.

The manager commanded that the work ____ finished by the end of this month.

A．should be

B．will be

C．must be

D．ought to be