I___for three hous when she called.
I___for three hous when she called.
A will study B studied C had studied D will have been studying
选哪个?
A will study B studied C had studied D will have been studying
选哪个?
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已知：a，b，c∈R+，求证：a+b+c≥ab+bc+ca．
1年前2个回答
你能帮帮他们吗