l saw him in the library yesterday he --- a book at that moment

l saw him in the library yesterday he --- a book at that moment

题目
l saw him in the library yesterday he --- a book at that moment
a reads
b is reading
c was reading
d will read
说理由!
答案
l saw him in the library yesterday.(有个句号) He --- a book at that moment.
答案选C
当时他正在看书.
或者:
l saw him in the library yesterday when he --- a book at that moment.
也是选C
过去进行时态.
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