单项选择题

Three criminals escaped from prison yesterday afternoon. It was a long time ______ the guards discovered what had happened.

A．since
B．when
C．until
D．before
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Writing a paper is a kind of academic writing which is a way to (1) new knowledge. The students examine an issue, review what is already known, think about what they have learned’ and come to some (2) . This means that each student mush present information and also take a position. The student might support an idea, question it or even disapprove it. Or he could show how a (3) may be understood better. And the student must support the position with evidence. Students in some countries may have learned to write (4) descriptions about something without ever stating the main idea. American students are expected to state their main idea at the beginning of the paper. In some cultures, paragraphs may be (5) to build toward the main idea which is revealed at the end. But in the United States, the main idea of each paragraph should be the first sentence. Another difference is about writing style. Other cultures may use lots of descriptive words but American English (6) short, strong sentences.
单项选择题
Susan is not at the meeting. She has been absent ______ our meeting for several times.
A．from
B．of
C．in
D．at
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