“Shall Mary come and play computer games?” “No she has finished her homework.”A. whenB.

问题补充：

“Shall Mary come and play computer games?” “No, she has finished her homework.”

A. when

B. since

C. unless

D. as soon as

答案：

A. when

B. since

(答案→)C. unless

D. as soon as

解析：此句为省略句，答句句首的 No 表明其后省略的是一个否定句，全句补充完整为：She can’t play computer games unless she has finished her homework.