单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage ,you will be given 20 seconds to answer the questions.
Now listen to the passage.

What kind of work did most American women do during the 1940s and 1950s

A.They worked in laundries.
B.They did typing and bookkeeping.
C.They worked as seamstresses.
D.They did laundry, cooking, and sewing at hom