Lots of scientists are working hard _____ send astronauts to Mars.

A. so B. but

C. in order to D. so that

C 【解析】句意：許多科學(xué)家正在努力工作，以便把宇航員送到火星�？疾檫B詞辨析題。A. so因此，表結(jié)果，后接從句；B. but但是，表轉(zhuǎn)折，后接句子；C. in order to為了，表目的；D. so that以便，后接從句。本句空格后send astronauts to Mars是動詞短語而非句子，可排除ABD三項。根據(jù)句意語境，可知選C。
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