The teachers are, at the moment, trying their best ______ all the necessary that their students may need for their critical examination while, sadly, some do not seem to appreciate that
A. to prepare
B. prepared
C. preparing
D. prepare
* Đáp án
A
* Hướng dẫn giải
Đáp án A To try + to V: cố gắng làm gì Try their best to prepare: cố gắng hết sức để chuẩn bị