【題目】Earthquakes always happen, so it is difficult to know when they come.
A.hopefully
B.suddenly
C.usually
D.luckily

【答案】B
【解析】句意:地震總是突然發(fā)生,因此要知道什么時(shí)候發(fā)生災(zāi)難。A.希望地:B.突然地;C. 通常地;D.幸運(yùn)地。由后句so it is difficult to know when they come.難以知道何時(shí)發(fā)生?梢酝茰y出其發(fā)生突然。故選B。

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