题目

如图为DNA分子的某一片段，其中①、②、③分别表示某种酶的作用部位，则相应的酶依次是（ ）                                                  A．解旋酶、限制酶、DNA聚合酶                   B．DNA酶、解旋酶、DNA连接酶         C．解旋酶、限制酶、DNA连接酶                   D．限制酶、DNA连接酶、解旋酶         His silence at the meeting suggested that he ________ to your plan. A. didn’t agree B. hadn't agreed C. wouldn't agree D. not agree