问题
选择题
________ my teacher didn't tell me directly, I still felt that I didn't live up to her expectation.
A．When
B．Since
C．As
D．While
答案
答案：D
D考察连词。句义：虽然老师没有直接告诉我，但是我仍然感觉到辜负了她的期望。While在本句中作为连词，意为：虽然；when既然，当…时；since因为，由于；as因为，随着；根据语境可知D正确。