Before you send the letter, with Bill to see if the address is right. A. check B

Before you send the letter, _____ with Bill to see if the address is right.

A. check B. to check      C. checking     D. checked

试题答案

A

解析:

before 引导的是时间状语从句，填空句为主句，而此主句为一祈使句，故动词用原形。