题目:
Though there is no one in the hall, he stands on the stage as if he ____watched and expected to deliver a speech.
A.has been
B.had been
C.were being
D.is being
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:阳离子半径与阴离子半径比值最小的应该是阳离子半径较小的和阴离子半径较大的离子构成的化合物,同一周期的离子电荷数大的半径小,同一族的原子序数大的半径大,在选项的三个阳离子中,Li+是阳...