The two sides to make peace, but something unusual .A. had intended; happenedB. intended;

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(答案→)A. had intended; happened
B. intended; happened
C. intended; had happened
D. would intend; happened
解析：本句意为“双方原打算讲和，但发生了一件不寻常的事”。had intended“原打算，本打算(但没做到)”，相对于过去的打算，后来发生的事用一般过去时。D项属于过去将来时，表示从过去某时看将要发生的动作或存在状态。常用在间接引语中。