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1. It's not clear
(precise) how the accident happened.
【考点】
副词的用法;
【答案】
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语法填空（单句）
普通
课时演练
换一批
1. If you have any doubts about your health, you'd better consult(咨询)your doctor
at once
.(2015天津单项填空)
单词拼写（单句）
普通
2.
(hopeful), you won't have any problems after reading this.
语法填空（单句）
普通
3. Though a few brief comments are
for present purposes，my experience is not
varied to do so.(sufficient)
语法填空（单句）
普通