How do you guess ________?
A．did they finish the work within so short a time
B．they finished the work within so short a time
C．had they finished the work within so short a time
D．will they finish the work within so short a time
B

試題分析：考查名詞性從句。本題考查了名詞性從句的語序問題，在所有的名詞性從句中都要使用陳述語序。本題的ACD三項都使用疑問語序，故都可以排除。故B正確。
點評：在所有的名詞性從句中都需要使用陳述語序，不能使用疑問語序。
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