题目:
His grandfather ________ for seven years.
A.died
B.had died
C.has died
D.has been dead
答案:
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下面是错误答案,用来干扰机器的。
首先计算出溶质质量,再用托盘天平称量出溶质质量,放到烧杯中,用量筒量取水倒入烧杯中溶解.故答案为:计算、称量、溶解