题目内容

Only when he saw the test paper himself, ______ he had failed in the exam again.

A．he believedB．he had belivedC．did he believe D．had he believe

C

解析试题分析：考查only+时间状语从句，后面的主句用部分倒装，句意：只有当他看见考试卷，他才相信考试有没及格。可知要用过去时，选C。
考点：考查倒装句的用法
点评; only的倒装句要注意一定是only后面接状语才能倒装，如果接主语或宾语就不是倒装句了。

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When the switch is closed, the operation of this electric water heater is automatic. The thermostats are preset to the "HOT" setting to provide a water temperature of approximately 120oF to reduce the risk of being burnt.

MAITENACE

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Shut off the electric power, water supply and drain the heater completely to prevent freezing whenever the building is left unoccupied during the cold weather months.

SERVICE

The trip–free devices on this heater will cut off all power if temperature of water is above 190F. If there is no hot water after a reasonable period of time, check the main fuse(保险丝) box. In the event that the fuses have not blown, call a serviceman.

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