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It's important to know how     for help when you are in trouble. A. ask B. to ask C. asking D. ask...

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of no value  very important  so expensive that people don't know how much it is  valueless"  
did he begin  had he begun  he began  he had begun  
how to study    when to study    which to study    what to study  
did he begin    had he begun    he began    he had begun  
poetry tends to made the reader disappointed  poetry makes its readers sentimental  poetry is more important than words  poetry often captures real human feelings  
What; that ; what    That; how; what    It ; that ; that    It; what ; that  
it    不填    that    this  
what, what    that, what    that, how    how, what  
or    until    as soon as   unless  
it    不填    that    this