It is reported that there are various reasons _____more and more people feel depressed at this time of year.
A．whyB．whenC．whatD．how
A
考查定語(yǔ)從句。先行詞是reasons，且定語(yǔ)從句缺少狀語(yǔ)，所以用why引導(dǎo)定語(yǔ)從句，在從句中作原因狀語(yǔ)。選A。
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