It is desirable that the airplane ___________ as light as possible.
（A）is
（B）were
（C）be
（D）had been
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更多大学英语选择题200道试题
- 1Seeing that the last bus was leaving, he made a ____________ for it while shouting "Wait! Wait!"
- 2The escaped prisoner waited until the _____ of night before leaving his hiding place.
- 3My roses grow well as long __________ they have just enough water and plenty of plant food.
- 4The fifth-generation computers, with the ability to think for themselves, _______ and perfected now.
- 5Although always on time himself, the professor was quite used __________ late for his lecture.
