9．We used to _____ contact with each other by writing but now we've got used to ______ online．（　　）
A．keeping in； chattingB．keep in； chatting
C．keeping in； chatD．keep in； chat

分析 我們過(guò)去通常通過(guò)寫信彼此保持聯(lián)系，但是現(xiàn)在我們習(xí)慣了網(wǎng)上聊天．

解答 答案是B．本題考查非謂語(yǔ)動(dòng)詞．句中考查了短語(yǔ)used  to 和be used to：used to"過(guò)去常常"，屬于情態(tài)動(dòng)詞，后面必須接動(dòng)詞原形；be/get used to"習(xí)慣于"，其中to是介詞，后面必須接名詞、代詞或動(dòng)名詞；根據(jù)句意，第一空在used to后接動(dòng)詞原形；第二空在got used to后表示"習(xí)慣于"，用動(dòng)名詞，所以答案選擇B．

點(diǎn)評(píng) 首先判斷選項(xiàng)中的動(dòng)詞在句中是以謂語(yǔ)還是非謂語(yǔ)形式出現(xiàn)，然后根據(jù)選項(xiàng)在句中的功能結(jié)合非謂語(yǔ)的基本用法做出合理的判斷．

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