(Viên chức Mầm non) 5000+ câu trắc nghiệm Ngoại ngữ có đáp án - Test 2

__________was one of the most difficult tasks pioneers faced on their journeys west.

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IV. WRITING

a. From the words or phrases - a, b, c or d - choose the one that best completes the sentences.

__________was one of the most difficult tasks pioneers faced on their journeys west.

Having crossed rivers

While crossing rivers

Crossing rivers

By crossing rivers

Giải thích

Đáp án đúng là c