have a good/hard/difficult time (in )doing sth這里的in可以省略的,因為in是介詞,介詞后面通常情況下可加名詞或動名詞（doing）
類似的還有have an interest (in) doingsth have fun (in) doing sth have trouble (in) doing sth 等
簡單來說就是have+（形容詞）名詞+(in)doing sth,當名詞可數(shù)時前面有a/an
可以當成短語來記憶
some persons have a hard time getting accustomed to the local way of marketing
some persons have a hard time getting accustomed to the local way of marketing
have a hard time +doing是個什么用法
have a hard time +doing是個什么用法
英語人氣：663 ℃時間：2020-01-27 08:52:03
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