Magnesium (has little) structural strength and must be (alloyed) with another metals (such as) aluminum and zinc when it is (to

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问题 Magnesium (has little) structural strength and must be (alloyed) with another metals (such as) aluminum and zinc when it is (to be subjected) to stress.

选项 A、has little
B、alloyed
C、such as
D、to be subjected

答案B

解析
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