单项选择题

Part Ⅱ Structure
Directions: This part is to test your ability to construct grammatically correct sentences. It consists of 2 sections.
Section A
Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A, B, C and D. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center. The old woman burst into tears at the bad news () her son had been killed by the enemy.

A.that
B.when
C.which
D.what