The man looked around when he walked along the pavement ___something A:as if to seach of B"as if in search of 为什么选B 不是有as if to do sth 为什么不选A呢

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The man looked around when he walked along the pavement ___something
A:as if to seach of
B"as if in search of
为什么选B 不是有as if to do sth
为什么不选A呢

as if to do sth 表示好像将要干.,将来的动作.
as if in search of 好像正在寻找.
因此B和题意.

in search of
是固定短语

in search of 是个固定词组.