单项选择题

At the meeting they discussed three different ______ to the study of mathematics.

A. approaches
B. means
C. methods
D. ways
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单项选择题
When Jane began to take swimming lessons, her main ______ was the fear of water.
A. evidence
B. crisis
C. obstacle
D. danger
单项选择题
Progress so far has been very good. ______ , we are sure that the project will he completed on time.
A. However
B. Otherwise
C. Therefore
D. Besides
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