题目:
Had I known about this computer program, a huge amount of time and energy .
A.would have been saved
B.had been saved
C.will be saved
D.was saved
答案:
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答案:D题目分析:L和R的化合价都为+2价,应为周期表第ⅡA族,根据半径关系可知R为Be,L为Mg;X和T的化合价都有-2价,应为周期表第ⅥA族元素,X的最高价为+6价,应为S元素,T无正价,应为O元素;T和Q同族,Q为S元...