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I can still remember that it is since the 1990’s, _____ we b

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I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased.
A.while; when B.when; what C.before; that D.when; that
D

考查强调句式第一空是when引导定语从句,表示“我们在那个时候开始使用手机”,第二空是强调句式的引导词,被强调的部分是时间状语,因此D项正确。