问题

_______ on your study, and you will make greater progress.
A:Concentrating
B:If you concentrate
C:Concentrate
D:To concentrate
B:If you concentrate
C:Concentrate
D:To concentrate
正确答案是:
同类题型
Danny is walking. He is __________ his way __________ home.[ ]
I ________ hear the news very clearly since the noise outside is so loud.
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Your father was worried about something this morning. Why?— He wondered .