The plane ____, its bombs exploding as it hit the ground.
答案为(D)crashed。但我不明白 The plane crashed 与 its bombs exploding 是个什么关系。
这是一个带独立结构的句子。its bombs exploding 就是一个独立结构，对句子进行补充说明(它还带有一个时间状语从句——as it hit the ground)。它是由名词短语 + 现在分词构成的。独立结构是一个常考的项目，必须熟练掌握。
请做下面的英语试题：
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The speech ____ a lively discussion started. A. being delivered B. was delivered C. be delivered D. having been delivered(全国四级,95.1-45)
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Night ____ (fall), we hurried home. (全国研考)
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Along the rocky New England coast are small areas of sand and gravel beach, some created from glacial debris, ____ by the action of ocean storms. A. upbuilding others B. others build up C. others built up D. built up others (TOEFL)
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The children went home from the grammar school, their lessons ____ for the day. A. finishing B. finished C. had finished D. were finished(全国高考重庆卷,07-25)
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The country has already sent up three unmanned spacecraft, the most recent ____ at the end of last March. A. has been launched B. having been launched C. being launched D. to be launched(全国高考山东卷,07-33)
(参见 absolute construction , being , with )