单项选择题

While building a highway across the desert, ______

A. an underground town was discovered
B. there was an underground town discovered
C. the workers discovered an underground town
D. a town was discovered underground

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单项选择题

A Russian-made rocket ______ a US telecommunications satellite ______ successfully ______ on Thursday.

A. carrying; is; launched
B. carrying; was; launched
C. carried; has; launched
D. carried; has been; launched

单项选择题

To read Tolstoy and ______ to nineteenth century Russian literature are two excellent reasons for taking Professor Morrel’s Course.

A. to introduce
B. introduce
C. being introduced
D. to be introduced