Peter said he ______ when he got there but we have never heard from him since then.

A．was writing

B．would write

C．had written

D．has been writing

工业酒精中含有甲醇，甲醇的化学式为CH₄O，关于甲醇的下列叙述正确的是(    )

A．甲醇是由1个碳原子、4个氢原子和一个氧原子构成的

B．甲醇中碳、氢元素的质量比为1：2

C．甲醇分子中有28个电子

D．甲醇完全燃烧时生成C0₂和H₂0的质量之比为11：9