问题：
[单选] ________had he arrived home than it began to rain．
________had he arrived home than it began to rain．
问题：
[单选] Not only the switches but also the old wiring ________ changed．
Not only the switches but also the old wiring ________ changed．
问题：
[单选] By the time you arrive, I ________ working for two hours．
By the time you arrive, I ________ working for two hours．
问题：
[单选,材料题] The author tends to think that the fifth level________
The author tends to think that the fifth level________
问题：
[单选] 回答题Human needs seem endless．They might be regarded as making up several levels．When there is e
回答{TSE}题Human needs seem endless．They might be regarded as making up several levels．When there is enough money to satisfy one level of needs, another level appears．The first and most basic level of
问题：
[单选,材料题] By selling special coffee at a coffee cafe, the students are________
By selling special coffee at a coffee cafe, the students are________
问题：
[单选] The development of the light bulb ________partly as a result of the widespread availability of
The development of the light bulb ________partly as a result of the widespread availability of electricity and the need for cheap, clean light．
问题：
[单选] It is a small country, yet has a lot of________resources．
It is a small country, yet has a lot of________ resources．
问题：
[单选] What we have to take________the courses offered only for this term．
What we have to take________the courses offered only for this term．
问题：
[单选] John________he could improve his exam results, but he did not have enough time to study．
John________ he could improve his exam results, but he did not have enough time to study．
