问题

We won’t be able to learn English well _____we learn enough words by heart and do enough reading[ ]

A: as
B: once
C: when
D: unless

正确答案是：

同类题型

Since the man had no choice but to fight back, we’d better _________ him.

The room ________ 10 metres across is large enough for a single man to live in.[ ]

What do you think of Nanchang?－Nowhere else _____ such beautiful scenery.

It won’t be long _______ you regret what you’ve done

Can I have a day off tomorrow I need to visit my grandma in the hospital—______I can manage without you