问题

It was after he had worked on the project for months _____ he found how to solve the problem efficiently. [ ]

A: that
B: when
C:is; play
D: as

正确答案是：

同类题型

Is this museum ___________ he wishes tovisit?

I haven’t seen you walk your dog recently? Why?—Well, I have _______ the habit, as it _______ too much of my spare time.

ousin is said ________ anew computer program recently, but do you know when he will finish it

The news ____is spreading around the airport is_____a heavy storm is coming

________by the beauty of nature，the girl from London decided to spend another two days on the farm[ ]