【題目】This hole is so small that only one person can pass it ________.

A. in timeB. on timeC. at a timeD. for a time

【答案】C

【解析】

句意：這個洞太小了，一次只能有一個人通過。A. in time及時；B. on time按時；C. at a time依次， 逐一；D. for a time一段時間。這里是是說一次，依次。根據(jù)題意，故選C。

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