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; whatC.before; that D.when; that
D
考查強(qiáng)調(diào)句式第一空是when引導(dǎo)定語從句,表示“我們在那個時候開始使用手機(jī)”,第二空是強(qiáng)調(diào)句式的引導(dǎo)詞,被強(qiáng)調(diào)的部分是時間狀語,因此D項正確。
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