22. A: Why does your sister bite her nails? B: She doesn’t enjoy _____ them; she just can’t help _____it.

Giải thích chi tiết đáp án:

なぜ正解が"biting / doing."なのかを理解するために、文 22 の各部分を分析してみましょう。

質問 22: A: Why does your sister bite her nails? B: She doesn't enjoy _____ them; she just can't help _____it.
A: Why does your sister bite her nails? B: She doesn't enjoy _____ them; she just can't help _____it.

1. **文B: "She doesn't enjoy _____ them" **

英語では、動詞「 enjoy 」の後に、 V-ing (gerund)をよく使います。これは基本的な文法規則です。したがって、最初の空白は「 biting 」でなければなりません。

- She doesn't enjoy biting them.

2. **文B: "she just can't help _____ it" **

"can't help"フレーズの後にはV-ing (gerund)も続きます。これは、誰かが何かをするのを避けたりやめたりできないことを表現するときの英語の文法の正しい使用法です。

- She just can't help doing it.

上記の 2 つの分析により、質問 22 の正解は次のようになります。

c. **biting / doing**

==> She doesn't enjoy biting them; she just can't help doing it.