问题

I tried many times, but I still failed to complete the experiment. — Cheer up. _______ and the problem will be solved. [ ]

A: If have a little effort
B: Having a little effort
C: If you have a bit effort
D: A bit more effort

正确答案是：

同类题型

Color-blind people often find it difficult to _____between blue and green.

______ your teacher ______ happy today

The wireless video camera is ________to send its video signal to a nearby base station，allowing it to be viewed on a computer or a television

_________ do you improve your listening –I improve my listening ________watching English movies.

The storm is moving slowly____________.