I can still remember that it is since the 1990’s, we began to use cell phones, the number

发布时间：2020-08-15 01:25:25


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

网友回答

A. while; when
B. when; what
C. before; that
(答案→)D. when; that
解析：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。
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