问题

Scientists from different countries are tryingto_______ a good way to solve the energy problem.

A: keep up with
B: comeup with
C:catch up with
D:meet up with

正确答案是：

同类题型

It’s so late. Why not write the report tomorrow–But I don’t know______ I can do it for you.

e out of ______ habit, not for ______pleasure; for I have been in the habit for more than twenty years．

ecause Tom has made some mistakes, _____youfollow that he is a bad boy

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