2. 外语
  3. The problem is______ we can master modern science and technology in a short time.

The problem is______ we can master modern science and technology in a short time.

admin2010-02-22  91
问题 The problem is______ we can master modern science and technology in a short time.
选项 A、if
B、that
C、what
D、how
答案D
解析
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