A. essential
Đáp án A
Động từ phía sau không chia => Câu giả định: It tobe + essential + that + S V-inf.
Các đáp án còn lại:
B. needed (V-ed): cần.
C. helpful (adj): hữu ích.
D. successful (adj): thành công.
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A: Do you mind if we schedule the meeting for 11 o’clock?
B: Well, actually, I ________ earlier
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