Many factories____in the past few years.
Manyfactories____inthepastfewyears.A:werebuiltB:hadbuiltC:hadbeenbuiltD:havebeenbuilt...
Many factories____in the past few years. A:were built B:had built C:had been built D:have been built (单项选择,给出答案并详解为什么选这个)
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