—Not really. She ___us clear directions and we were able to find it easily?
A:was to give
B:had given
C:was giving
D:would give
What's the matter with you?
取5.0克氧化镁与氧化铜的混合物,加入稀盐酸(含0.2mol的HCl),恰好完全反应生成盐和水,原混合物中金属元素的质量是( )