该结构属于独立主格结构做时间状语，状语分词所表示的动作发生在谓语动词之前，所以应该用完成体，答案为D。
10）动名词复合结构
动名词符合结构可以做主语、宾语和表语，在对动名词的考查中总是将其逻辑主语包括进来，形成动名词的复合结构：
① _____ in an atmosphere of simple living was what her parents
wished for.(1999.1)
A. The girl was educated B. The girl educated
C. The girl’s being educated D. The girl to be educated
本题涉及题眼比较多，A，为从句做主语，但缺少that，D为不定式做主语，但缺少for(for the girl to be educated)，B结构不能做主语，答案是C，为动名词的复合结构。
② Ann never dreams of _____ for her to be sent abroad very soon.
A. there being a chance B. there to be a chance
C. there be a chance D. being a chance
介词后用动名词，表示存在时必须用there be句型，所以答案为A，这也是动名词复合结构，there为动名词的逻辑主语。
③ I don’t mind ____ the decision as long as it is not too late.
A. you to delay making B. your delaying making
C. you delaying to make D. you delay to make
Mind要求接动名词,动名词的逻辑主语用形容词性物主代词，答案自然是B。
④ I would appreciate _____ it a secret.(1995.6)
A. your keeping B. you to keep
C. that you keep D. that you will keep
本题与上一题类似，答案是A。
2．非谓语动词解题策略
1）正确判断非谓语动词
这类题一般出现在独立主格结构中，如果在选项与句子之间没有连词，则说明，所选为独立主格结构，既名词或主格代词 + 分词。
All things ______, the planned trip will have to be called off.
A. considered B. be considered
C. considering D. having considered
句子没有连词，说明所选结构不属于从句，那么就是独立主格做状语，根据动词与其逻辑主语之间的关系为动宾关系，答案应该是A。
____, a man who expresses himself effectively is sure to succeed
more rapidly than a man whose command of language is poor.(1997.6)
A. Other things being equal
B. Were other things equal
C. To be equal to other things
D. Other things to be equal
做状语的可以是从句，但B的结构是虚拟条件，与这里不符，不表目的，C不对，不表将来，独立主格中非谓语动词不能是不定式，答案为A。
4） 判断动名词复合结构的方式
主语位置上，或动词、介词后的"名词代词 + 非谓语动词"，如果表示的是一个事件则是动名词复合结构，而不是"名词 + 定语。请看以下各例：
He insisted on the windows _____ open while he was sleeping.
A. left B. being left C. leaving D. be left
insist on后不接从句，D可以排除。这里表达的是坚持要求"开着窗子睡觉"，所以应该是动名词复合结构，答案为B。
The road __________ caused us to be for our work for half an hour.
A. blocked B. was blocked
C. blocking D. being blocked
