—Listen! Who ______ in the next room? The voice is so beautiful.A. sings B. sang

—Listen! Who ______ in the next room? The voice is so beautiful.A. sings B. sang

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—The firemen tried their best to ______ the fire but in vain.A. put up B. put fo

—The firemen tried their best to ______ the fire but in vain.A. put up B. put fo

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—The construction of the new bridge has been ____ for two weeks because of th...

—The construction of the new bridge has been ____ for two weeks because of th...

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只要做好设备的保护接地或保护接零,就可以杜绝触电事故的发生。A.正确B.错误

只要做好设备的保护接地或保护接零,就可以杜绝触电事故的发生。A.正确B.错误

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—The plane was about to ______, and yet I left my ticket behind.A. take off B. t

—The plane was about to ______, and yet I left my ticket behind.A. take off B. t

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