We didn't study English last night,but we ______.A.had studied B.couldC.should D.could have为什么选D,不懂

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Wedidn''tstudyEnglishlastnight,butwe______.A.hadstudiedB.couldC.shouldD.couldhave为什么选D,不懂Wedidn''tstud

We didn't study English last night,but we ______.A.had studied B.couldC.should D.could have为什么选D,不懂
We didn't study English last night,but we ______.
A.had studied B.could
C.should D.could have
为什么选D,不懂

We didn't study English last night,but we ______.A.had studied B.couldC.should D.could have为什么选D,不懂
D.
解释为本来可以(在昨天晚上学习英文),运用了虚拟语气