Question

【题目】When the telephone rang, I happened ______ a book.
A.to be reading
B.to read
C.read
D.to have read

Answer 1

【答案】A
【解析】考查不定式的进行式。。句意：电话响起的时候我正好在读一本书。不定式的进行式，表示与谓语动词同时发生，故选A。