他们从来都是尽心尽力，这一点没变过。
They 've always been doing their very best.
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've英 /v/|美 /v/
always英 /ˈɔːlweɪz/|美 /ˈɔlweɪz/
been英 /biːn/|美 /bɪn/
解释
have + always + been + V-ing：always 插在助动词与 been 之间，表示从过去到现在的持续一贯性，强调从未间断。
They 've always been doing their very best.
have + always + been + V-ing：always 插在助动词与 been 之间，表示从过去到现在的持续一贯性，强调从未间断。