Since the forest has been destroyed by a big fire, a large of trees to be planted on the

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A. number; has
B. amount; has
(答案→)C. quantity; have
D. sum; have
解析：第一空考查短语的用法：tree是可数名词，可以用a large number of或a large quantity of修饰，如果是A项，第二空应该填have，C项正确，因为a large quantity of后面修饰可数名词复数谓语用复数。选C。