问题
选择题
Double ovens are a good idea, especially _____ you are cooking several meals at a time. [ ]
A. though
B. if
C. that
D. unless
答案
答案：B
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Double ovens are a good idea, especially _____ you are cooking several meals at a time. [ ]
A. though
B. if
C. that
D. unless
答案：B