2. 自考
  3. More than one example ______ necessary to make the students understand this rule clearly.

More than one example ______ necessary to make the students understand this rule clearly.

admin2010-12-12  60
问题 More than one example ______ necessary to make the students understand this rule clearly.
选项 A、should be
B、is
C、are
D、have been
答案B
解析
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