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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有继续之意,常用于keep on doing中,keep up是维持、保持的意思。本题是“保持习惯”的意思。which与as都可引导非限制性定语从句,但在从句中作主语时常用which,且as常有“正如……,像……一样”的意思。
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