单项选择题


Questions 5 to 7 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.
Now, listen to the conversation.
What course is the student interested in

A．A two-month course.
B．A course that lasts for the summer.
C．A course of 23 weeks.
D．A course of four and a half weeks.
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[听力原文]UFOsThere are many explanations for why UFOs visit the Earth. The most popular one is that they may be visitors from other planets. To fly such aircraft, their builders must develop different forms of aviation, because they seem to fly much faster than normal aircraft. The UFOs, it is believed, must contain scientists from other planets who are studying life on earth. It is even believed that several such aircrafts may have landed on earth and the space visitors may be living among us. But there are also less fantastic explanations available. Although some sightings of UFOs are difficult to explain, most can be explained quite easily. In many cases the observers might have made a mistake. They might have seen a weather balloon or an aircraft. Or the light they saw in the sky might have been light from the ground, reflected on the clouds. However, the exact cause of many sightings still remained a mystery.[听写提示]本文的难点主要是表示推测的几个句子。第一段最后一句中several such aircrafts may have landed on earth和第二段第三、四、五句中的might have+V-ed可能会给听写造成困难，因为表示对过去的推测时have都轻读，[h]的读音省略，与前面的情态动词连读。如果不熟悉这一语音现象，错误很可能就会发生。补救的措施是进行快速的语法分析。
单项选择题
He said that the driver must have had an accident; otherwise he ______ by then.
A．would have arrived
B．must have arrived
C．should arrive
D．would arrive
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