填空题

The boss told us not to use more materials 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。

答案: A-D-B-C
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