I ____come yesterday, but I couldn’t. A. was to have B. must C. ought D. have to

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I____comeyesterday,butIcouldn’t.A.wastohaveB.mustC.oughtD.havetoI____comeyesterday,butIcouldn’t.A.wa

I ____come yesterday, but I couldn’t. A. was to have B. must C. ought D. have to
I ____come yesterday, but I couldn’t. A. was to have B. must C. ought D. have to

I ____come yesterday, but I couldn’t. A. was to have B. must C. ought D. have to
答案是A.我们可以从“but I couldn't”中看出该句话的时态为过去式,所以D是不行的.
C.Ought to do是固定搭配,意思是应该做某事.
B代入句子中:I must come yesterday,but I couldn't.我昨天必须来,但是我却不能来.虽然语法正确,但是和后面的could的婉转语气不相符合.
相比之下A更适合,我昨天计划来,但是却不能来.
如果有两个迷惑选项的时候,可以进行比较选出最恰当的那个.不认识的固定搭配可以摘抄下来.
相信你的英语会越来越好的!

选A.     was to do表示计划要做某事。     must和have to太绝对,could是表委婉语气。         ought后面必须加to,意思是应该做某事。