单项选择题

The boss told us not to use more material than is necessary.

A. 老板让我们按需要用料，别多用材料。
B. 老板让我们不要多用材料，这没必要。
C. 老板没让我们用必须要用的材料。
D. 老板让我们不要用不必要的材料。

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