设 $\boldsymbol{M}_1=\left(\begin{array}{rrr}1 & -2 & 3 \\ -2 & 2 & 3 \\ 3 & 3 & 3\end{array}\right), \boldsymbol{M}_2=\left(\begin{array}{rrr}1 & 0 & 0 \\ -2 & 2 & 0 \\ 3 & 3 & 3\end{array}\right), \boldsymbol{M}_3=\left(\begin{array}{rrr}2 & 0 & 0 \\ -2 & 2 & 0 \\ 3 & 3 & 2\end{array}\right)$, $\boldsymbol{M}_4=\left(\begin{array}{rrr}2 & 0 & 0 \\ -3 & 0 & 0 \\ 3 & 2 & 2\end{array}\right)$, 则 $\boldsymbol{M}_1, \boldsymbol{M}_2, \boldsymbol{M}_3, \boldsymbol{M}_4$ 中不能与对角阵相似的是
A. $\boldsymbol{M}_1$
B. $\boldsymbol{M}_2$
C. $\boldsymbol{M}_3$
D. $\boldsymbol{M}_4$