摘要： challenging
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_________ difficult and challenging the task may be, we must finish it on time, because there is a possibility _________we’ll be fired if we can’t fulfill the task on time．
| A．Whatever; that | B．However; that |
| C．Whatever; which | D．However; as |
Engineering is ______ challenging course of study that requires ______ thorough understanding of mathematics and science.
A. the; a B. a; the C.不填；不填 D. a; a
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_______ difficult and challenging the task may be, we must finish it on time, because there is a possibility _______our work will go down in history.
A. Whatever; that B. However; as
C. Whatever; which D. However; that
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