題目列表(包括答案和解析)
______ we are doing has never been done before.
A. That B. What
C. Which D. Whether
_______ we are doing has never been done before.
A. That B. What
C. Which D. Whether
_______ we are doing has never been done before.
A. That B. What
C. Which D. Whether
____we are doing has never been done before.
A. That B. Which C. whether D. What
_______ we are doing now has never been done before.?
A. That B. What?
C. Which D. Whether?
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