中国大学MOOC: He was _____ firing when he suddenly pulled his finger off the trigger.
举一反三
- He was _____ firing when he suddenly pulled his finger off the trigger. A: on the top of B: on the tip of C: on the verge of D: on the side of
- When he finished the story, he pulled back his _____ and revealed the scar on his arm.
- He _____(walk) to his car when he stopped. He suddenly _______(remember) that he _______(not lock) the door.
- 中国大学MOOC: When he got home, he found his pocket _______ open and his wallet _______.
- 中国大学MOOC: Toms parents died when he was a child, so he was ______ by his relatives.