There large quantities of things for him to do, but he managed to finish the work as requi

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(答案→)A. were
B. was
C. are
D. is
解析：考察时态和主谓一致。根据第二句中的managed说明本句使用一般过去时。第一句是there be句型，该句型遵循就近一致的原则，谓语动词与后面的名词保持一致。无论large quantities of后面接任何的可数还是不可数名词的形式，谓语动词都使用复数形式。故A正确。