阿摩線上測驗
17. The great snake was uncoiling itself rapidly,______out on to the floor. People throughout the reptile house screamed and started running for the exits.
(A) slithering
(B) slithered
(C) slither
(D) slithers
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統計： A(6), B(0), C(0), D(0), E(0) #3049971
統計： A(6), B(0), C(0), D(0), E(0) #3049971
