题目

When talking about humor, people often refer to famous humorists such as Samuel Langhorne Clemens, better known by the pen-name Mark Twain.    Samuel Langhorne Clemens, America’s famous writer, journalist and humorist, was born in Florida on November 30, 1835. He was the sixth of the seven children in the family. As a child, Samuel was often kept indoors because of his poor health.    When Samuel was 12, his father died of a deadly disease and at the age of 13, Samuel had to leave school to make a living. He became a printer’s apprentice（学徒）. A year later, he became skillHe's got himself into a dangerous situation ________ he is likely to lose control over the plane. [　　] A．whereB．which C．whileD．why