题干
More than 80 people ______ in the earthquake ______ last week.
A：died; for
B：have been dead ; since
C：have died; since
D：have been dead; for
答案(点此获取答案解析）
C
More than 80 people ______ in the earthquake ______ last week.
A：died; for
B：have been dead ; since
C：have died; since
D：have been dead; for
)能高效催化醋酸酐和磺胺的反应。