问题 选择题

When my cat is hungry, he _______ the cage door _______ his paw.

A.knocks on, in

B.knocks at, with

C.knocks on, by

D.knocks at, uses

答案

:B

: knock at sth with sth,意思为用···敲···,故选B

单项选择题
单项选择题