Everyone has periods in their lives __________ everything seems very hard.
A．whenB．whereC．whichD．that
A
考查定語(yǔ)從句。本題的關(guān)系詞引導(dǎo)定語(yǔ)從句修飾periods，并在從句中做時(shí)間狀語(yǔ)，因此選A。
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