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.