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單項(xiàng)選擇題

An explosion is a sudden increase in amount（）

A.rapid burning causes it
B.to be cause dby rapid burning
C.causing it'burningtoberapid
D.caused by rapid burning

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Some say yes and others say no; I don't know （）to follow.

A.whether
B.what
C.whom
D.how

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Shall we request the chairman（）our suggestion again?

A.toconsider
B.considering
C.consider
D.considered