— Have you solved your problem?
— I’ve kept on thinking about that matter__________, but I have had no idea.
A．a(chǎn)t timesB．some time
C．a(chǎn)t a timeD．a(chǎn)ll the time
D

試題分析：—你解決了你的問題了嗎？—我一直在考慮這個問題，但我還沒有主意。A. at times有時； B. some time一段時間； C. at a time一次； D. all the time總是，一直，根據(jù)句意此題選D。
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