Question

I was surfing the Internet       my brother was doing his homework.

A．a(chǎn)fter

B．because

C．while

D．When

Answer 1

C

解析試題分析：句意：當(dāng)我的弟弟在做作業(yè)的時(shí)候，我在上網(wǎng)。A在……之后 B因?yàn)?C當(dāng)……時(shí)候（同時(shí)進(jìn)行）D當(dāng)...時(shí)候，就在這時(shí)；此題中兩個(gè)動(dòng)作同時(shí)進(jìn)行，而且連詞后是進(jìn)行時(shí)態(tài)。所以要用while。故選C.
考點(diǎn)：考查時(shí)間狀語從句的用法。