On reaching home I discovered that I________my keys at the office.

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问题 On reaching home I discovered that I________my keys at the office.

选项 A、left
B、have left
C、was left
D、had left

答案D

解析本题考查时态的选择。根据“I discovered”可知，整句为过去时态。钥匙忘在办公室发生的时间早于发现的时间，故应该选择过去的过去，即过去完成时态，故选D。

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成人本科学位英语

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On reaching home I discovered that I________my keys at the office.

成人本科学位英语

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Todaythesmalltownisbetter______againstfloodthanitwas20yearsago.

Forthispart,youareallowed30minutestowriteacompositiononthetopicCanMoneyBuyHappiness?Youshouldwritenoless

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Whenheleft______college,hegotajobas______reporterinanewspaperoffice.

Theheadofthecompanypromisedtodealwithmattersofthissort______hereturnedtohisoffice.

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