单选题：（　　）I'mmistaken,I'veseenthatmanbefore．

题目内容：

（　　）I'mmistaken,I'veseenthatmanbefore． A．Unless
B．If
C．Because
D．Provided

参考答案：

答案解析：

Aeroplanescanclimbquickly（　　）．

Aeroplanescanclimbquickly（　　）． A．inwarmair B．incoldair C．whenitreachesthepolarr

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LincolnwasinvitedtospeakattheNationalSoldiersCemeterybecausehewas（　　）． A．afamou

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Atunnelwouldbe（　　）． A．lessexpensivetobebuiltthanabridge B．moreexpensivetobebuil

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Hersuggestionthateverybody（　　）wasnotappreciated． A．singasong B．sangasong C．sung

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