They _________ the habit of visiting old friends,_________ I think is great.?
A．keep on;whichB．keep up;which?
C．keep on;asD．keep up;as ?
B?
keep on有繼續(xù)之意,常用于keep on doing中,keep up是維持、保持的意思。本題是“保持習(xí)慣”的意思。which與as都可引導(dǎo)非限制性定語從句,但在從句中作主語時(shí)常用which,且as常有“正如……,像……一樣”的意思。
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