问题
选择题
The famous scientist for about two months. [ ]
A. have died
B. has died
C. has been dead
D. died
答案
答案：C
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The famous scientist for about two months. [ ]
A. have died
B. has died
C. has been dead
D. died
答案：C
Ca2＋＋2H2O＋2CO2↑