20 câu Trắc nghiệm Tiếng Anh 12 Cánh diều Chuyên đề 17: Thức giả định (Subjunctive mood)
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It's vital that the United States_________on improving its public education system. What we do now will affect our country for generations to come.

15/20

It's vital that the United States_________on improving its public education system. What we do now will affect our country for generations to come.

focuses

focus

focusing

to focus

Giải thích

Chọn đáp án B