2. 外语
  3. _____its nest in a tree cavity, but a mated pair may also perch in trees.

_____its nest in a tree cavity, but a mated pair may also perch in trees.

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问题 _____its nest in a tree cavity, but a mated pair may also perch in trees.
选项 A、If the wood duck can build
B、Because the wood duck will build
C、How does the wood duck build
D、The wood duck builds
答案D
解析 The first clause needs a subject and a verb: The wood duck builds.
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