题目内容
More historical buildings in the old town will fall down ________we try our best to protect them.
| A．if | B．since | C．unless | D．in order that |
C
解析试题分析：句意为：如果我们不尽力保护，老城里更多的历史性建筑将倒塌。if：如果， since：自从……以来， unless ：如果不， in order that：为了。结合语境可知应故选C。
考点：考查连词辨析。
．Hurry up, ________ you’ll not catch the first bus.
| A．and | B．or | C．but | D．if |
In American, a friend inviting you to a restaurant doesn't mean that he or she will pay for the meal ______ you are told ahead.
| A．until | B．unless | C．although | D．if |
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— I'm afraid not _______ you have finished your homework.
| A．if | B．unless | C．because | D．but |
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—Last night I watched TV 12 o’clock.
| A．when | B．until | C．as | D．while |
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| A．Nothing; unless | B．Few; till | C．Something; until | D．Little; since |
_______ everyone is here, let’s begin our meeting.
| A．So | B．As a result | C．Until | D．Since |
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—Oh, it’s raining outside. Don’t leave it stops.
| A．while | B．if | C．until | D．after |