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为什么马克思说，科学技术是历史发展的火车头？

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Some of my American friends are looking forward to _____my home town.

A. visiting
B. be visiting
C. visit
D. having visit

Not until I began to study hard _____ how much time I had waste.

A. I have realized
B. I realized
C. have I realized
D. did I realized

The truck took the products back to the factory _____ it had set off.

A. to which
B. in which
C. from which
D. which

The new leader is trying to find ______ to the old problem of the company.

A. reply
B. an answer
C. a reaction
D. a solution