考古題 0310 structure #28

[epoch]

28.The technique of spectroscopy allows analyst of
incoming light after it has been separated into
its component wavelengths by passage through
a prism.

請問答案A是否要改成analysis
另外 有答案D這種用法嗎 (我覺得是by passing through a prism)

[Mocha]

這題我也錯了
我當初也是以為答案是D... (by passing through a prism)

請問答案D為什麼是對的?
有沒有大大能幫忙解這題...感激