打扰大家了，请教一个很弱的问题。

ryan121

Some buildings that were destroyed or heavily damaged in the earthquake last year had been

(were)constructed in violation of the city's building code.

请问为什么是had been 而不是were.谢谢各位了。这个地方我不太明白。

bandito

这是一个时间顺序问题。使用had been是指后面的动作发生在前面（were）之前。而使用were则导致时间顺序不明确。

ryan121

谢谢楼上指点 这下我清楚了