Everyone has periods in their lives ______ everything seems very hard.
A．whenB．whereC．whichD．that
A
考察定語從句關(guān)系詞用法，根據(jù)前置詞period期間，可知關(guān)系應(yīng)用when當(dāng)……時(shí)候，in their lives為插入語，故選A。
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