2. 外语
  3. ______ did Arthur realize that there was danger.

______ did Arthur realize that there was danger.

admin2012-03-02  30
问题 ______ did Arthur realize that there was danger.
选项 A、Upon entering the store
B、When he entered the store
C、After he had entered the store
D、Only after entering the store
答案D
解析 因为本句采用的是到装，能引起到装的只能是选项D，因为引起的状语置于句首，主句应到装。
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大学英语四级

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