题目内容

In this way, the cost could be reduced. That is a _______ to a tenth of the cost of building a railway.

A. five
B. fiveth
C. fifth
D. fives

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Whether that is cheap enough for the system to be practical _______ to be seen.

A. remain
B. remains
C. remaining
D. to remain

Perugia is an old city _______ narrow, steep streets do not make existing methods efficient.

A. which
B. that
C. whose
D. who

This study suggested that the system _______ the cost of building it within seven years.

A. would repay
B. repays
C. repay
D. repaying

China might benefit _______ this new system.

A. to
B. for
C. with
D. from