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  3. The missing bird ______ from the hole in the cage.

The missing bird ______ from the hole in the cage.

admin2009-08-21  31
问题 The missing bird ______ from the hole in the cage.
选项 A、would be escaping
B、must have escaped
C、might as well escape
D、was to have escaped
答案B
解析 must have been表示较为肯定的猜测
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