Luckily ______ to be no one under the tree when it broke down.
A．it happenedB．there happenedC．there usedD．it had
B
本題考查there be句型與happen to的連用，根據(jù)句意可知需要用there be結(jié)構(gòu)，happen to表示“碰巧”。句意：幸運的，當樹倒下的時候，下面碰巧沒有人。
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