Our English teacher is now busy ________ for the exam.
A.to prepare
B.preparing
C.to preparing
D.prepare
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B解析本题主要考查be busy这个结构后面接to do还是接doing。在英语中,大多数“be+形容词”的后面都是接不定式to do,但有少部分是接doing的,上述例题be busy doing就是其中一例。例如:Our headmaster is busy talking with others.我们校长正忙着跟别人谈话。She is busy telephoning her mother.她正忙着给妈妈打电话。