问题

Researchers _______ to study mice from early ages but came across technical difficulties, so they weren’t sure they could expect clear results.

A:intended
B:were intended
C:had intended
D:had been intended

正确答案是：

同类题型

You only had meat and fish yesterday. If you had eaten vegetables, theyeasily.

This kind of flower well these days. Would you like to have one

－The dish is delicious!－Well, at least it’s as as the one I cooked yesterday.

My family and I will go back to the USA tomorrow.— ____________

My parents want me to get further study to be ____ an engineer _____ a scientist,______ I would like to be a famous surgeon doctor.