Question

If you don’t know ________ the new robot toy, you’d better read the instructions first.

A．where to mend

B．how to make

C．how to use

D．where to buy

Answer 1

C

考查疑问词+ to do作宾语，where to mend去哪修理，how to make如何做，how to use如何使用，where to buy去哪买，句意：如果你不知道如何使用这个新的机器人玩具，你最好先读一下说明书。所以选C。