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福建省三明一中2010-2011学年高一第二次月考英语试题
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. Because so many visitors are visiting our school today, some teachers have to _______ guides.
A. serve as B. regard as C. treat as D. use as
22. He came back late, _____ which time all the guesses had already left.
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. Because so many visitors are visiting our school today, some teachers have to _______ guides.
A. serve as B. regard as C. treat as D. use as
22. He came back late, _____ which time all the guesses had already left.
