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單項(xiàng)選擇題

I look forward to（）for this at your earliest convenience.

A.having your approval
B.approved by you
C.get your answer
D.know your opinion

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I know nothing（）about it.

A.whatever
B.whichever
C.whoever
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I immediately telephoned the engine room to tell（）was happening to the C／E.

A.it
B.this
C.what
D.that