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27.  “Shall Mary come and play computer games?”

 “No, _______ she has finished her homework.”

A. when           B. since        C. unless           D. as soon as

--Shall Mary come and play computer games?

--No, __________ she has finished her homework.

A. when         B. if               C. unless    D. once

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

A. when  B. since

C. unless D. as soon as

--Shall Mary come and play computer games?

--No,__________ she has finished her homework.

A. when         B. if               C. unless    D. once

--Shall Mary come and play computer games?

--No,__________ she has finished her homework.

A. when         B. if               C. unless    D. once