Theprofessorworkedfor7hoursata_______

Theprofessorworkedfor7hoursata________.

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Theprofessorworkedfor7hoursata________.

A、stretch
B、extend
C、expand
D、prolong

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正确答案：

答案解析：

此题考查的是固定词组搭配。 at a stretch 一口气地

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