Question

--Thank you very much.
--Not at all , I was____________ glad to help.

A．too

B．only too

C．not so

D．much

Answer 1

B

only too…to，just too…to，simply too…to等，后面的动词不定式不表否定意义。A、B两项不合题意，可排除；D项much不修饰一ad这样的普通形容词原级。