Researchers sometimes become () when their efforts appear to have produced less obvious results.

A．monitorsB．doctorsC．nursesD．researchers

We can hear mobile phone ring no matter where we are and it is quite annoying sometimes. W

The phenomenon which sometimes occurs in which incorrect linguistic features becomes a per

Because of television and worldwide computer connections, people can now become familiar w

His manual of botany has become a________among scientists.A．masterpieceB．classicC．famous w

【C8】A．some timeB．some timesC．sometimeD．sometimes