如果大家都愿意冒险，证券市场线斜率就大，风险溢价就大；如果大家都不愿意冒险，证券市场线斜率就小，风险附加率就较小。 ()
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Section A
Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, and D.
______I was going out, it began to rain.
A. When
B. While
C. As
D. Since
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