What are contextual clues? Find out the meanings of the words in bold type and tell what contextual clues have helped you in arriving at the meanings.
A、 Do you know the architect? He designed St. Paul's Cathedral.
B、 The book was only published posthumously, for the author had been dead for three years already.
C、 It is undesirable to write with too many parentheses, a pair of brackets round word or phrases.