Question

—Can you describe _____ it happened?
　　—Yes, I was riding on my bike _____ a car knocked me down from behind.

A．when; as

B．how; as

C．how; when

D．how; while

Answer 1

C

解析試題分析：句意：你能描述一下它是怎么發生的嗎？好的，我正在騎自行車時，突然一輛車從背后把我撞倒了。when突然 。故選C
考點：be doing…when句型
點評：除上述句型外，還有be about to do sth…when正將要做…突然，注意理解when的意思，而while表兩個動詞同時發生。as表“一邊…一邊”“隨著”之意。