---Did you return Helen’s call?---I didn’t need to I’ll see her tomorrowA. thoughB. unles

问题补充：

---Did you return Helen’s call?

---I didn’t need to I’ll see her tomorrow．

A. though

B. unless

C. when

D. because

答案：

A. though

B. unless

C. when

(答案→)D. because

解析：此题考查连词表示原因故用because。