27. It is dangerous ____ your seatbelt fastened during the
entire flight.
(A)to keep
(B)that keeping
(C)not to keep
(D)to not
keeping
詳解 (共 4 筆)
未解鎖
解析:這句話的意思是「在整個飛行過程中保...
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It is dangerous ___...
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這是一個典型的 虛主詞 It 開頭的句型...
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It is dangerous not...