______TomhasdonereallyamazedeveryoneinhisclassA．Wha

______Tom has done really amazed everyone in his class.

A．What

B．Which

C．That

D．Who

正确答案：A
解析：本题考查关系代词型的what的用法what引导从句表示“thethingswhich…”此题中what引导的从句在句中做主语此句句意为“汤姆所做的事情确实让班里的同学大吃一惊”因此A项符合题意