英语8. Seeds usually germinate ________ the temperature is favorable. </O >

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8. Seeds usually germinate ________ the temperature is favorable. </O >
<O >A. if B. whereas C. as a result D. in consequences </O >
<O >9. Francis Preston Blair. Jr, ________ born in Kentucky, lived and practiced in Missouri. </O >
<O >A. was B. he was C. although D. who he was </O >
<O >10. ________, work songs often exhibit the song culture of a people in a fundamental form. </O >
<O >A. They occur where they are B. Occurring where </O >
<O >C. Where they occur D. Where do they occur </O >
为什么

8.选A，如果。
B虽然，不合语义；C应该说as a result of；D结果，而且句式不对。
9.选C。
一句话中不能有两个并列的动词，可以排除AB；D不符合从句形式，应该说who was。
10.选B。
句子已经有主语work songs了，可以排除ACD三项。B的主语与主句一致，即work songs。

8a 温度适宜，种子就会萌发。9a was于后面的lived practiced并列 10a 其他的似乎都不能构成一句子。