【单选题】The bo y studied the signs for over an hour, but still could not them , so he turned to his teacher for help. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
make use of
B.
make sense of
C.
make much of
D.
make up of prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>