Many lessons are now available online, from _____ students can choose for free.
A. whose B. which C. when D. whom
答案
B
【解析】
【详解】考查定语从句。句意：许多课程现在都可以在网上找到，学生们可以从中免费选择。此处是非限定性定语从句，先行词是many lessons，关系词在从句中做介词from的宾语，应使用关系代词which引导。故选B。
Now that energy prices are rising so rapidly, further prices are very uncertain, and the risk _____ a new investment depending on them may fail is greater.
A．that B．by which C．at which D．in that
I talked to the girl ______car had broken down in front of the shop.
A. who B. her C. whose D. which
The couple _____ photo I took at the party were very pleased with it.
A. whose B. who C. which D. what
Thousands of African-Americans cheered Obama’s being elected American President in the streets on November 4th 2008, many of ________ even cried with joy.
A. those B. them C. whom D. which
Venus has a dense atmosphere, _____ we know very little.
A. its composition B. whose composition
C. about which composition D. about whose composition
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