开放性气胸的急救首先是
A. 抗生素治疗
B. 闭合伤口
C. 药物止痛
D. 输液
Which tense is used in the capitalized section of each sentence. By the time I arrived JOHN HAD BEEN COOKING for 30 minutes.
A. Past simple
B. Past continuous
C. Past perfect
D. Past perfect continuous
Which tense is used in the capitalized section of each sentence. When I arrived JOHN WAS COOKING.
A. Past continuous
B. Past perfect
C. Past perfect continuous
D. Past simple
Match the given sentence with its usage.When I arrived JOHN WAS COOKING.
An action that began before a time in the past and continued up until that time with no indication whether or not the action continued beyond that time
B. Action in progress at a past time
Completed past action
D. Action completed before another past action
微信支付 
支付宝支付