2. 外语
  3. Even the best students cannot answer this question. It ______ be very difficult.

Even the best students cannot answer this question. It ______ be very difficult.

admin2009-01-04  49
问题 Even the best students cannot answer this question. It ______ be very difficult.
选项 A、should
B、must
C、need
答案B
解析
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