Mark the letter A, B, c, or D on your answer sheet to indicate the correct answer to each of the following questionsThey will be able to walk across the river _______ . A. when the ice will

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Mark the letter A, B, c, or D on your answer sheet to indicate the correct answer to each of the following questions

They will be able to walk across the river _______ .

when the ice will be thick enough

if the ice will be thick enough

if the ice is thick enough

unless the ice is thick enough

Giải thích

Chọn C