B
try out 试验,考验,提炼
本句已有动词was,后面如再用动词则要用现在分词.
本句时态为过去进行时.
When he was a child,he was always _______ out new
When he was a child,he was always _______ out new
A.try B.trying
C.taking D.tried
A.try B.trying
C.taking D.tried
英语人气：568 ℃时间：2019-10-11 21:20:52
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