问题
选择题
We'll plant trees tomorrow, and I don't know _____ Tom will come and join us. [ ]
A. if
B. which
C. what
D. where
答案
答案：A
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We'll plant trees tomorrow, and I don't know _____ Tom will come and join us. [ ]
A. if
B. which
C. what
D. where
答案：A