问题
选择题
—What are you thinking about?
—I'm thinking about ______ to go for a picnic. [ ]
A. what
B. whether
C. that
D. if
答案
答案：B
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—What are you thinking about?
—I'm thinking about ______ to go for a picnic. [ ]
A. what
B. whether
C. that
D. if
答案：B