下图为DNA分子在不同酶的作用下所发生的变化,图中依次表示限制性内切酶、DNA聚合酶、DNA连接酶、解旋酶作用的正确顺序是 ( ) A.①②③④ B.①②④③ C.①④②③ D.①④③② 答案:C
After the glass fell to the ground and broke, the boy ________ his grandmother about it.
[ ]
A.didn't dare to tell
B.dare not telling
C.dare not to tell
D.not dare tell