21.                that the constant need for new clothes for them is getting to be a real headache.(grow)

正是因?yàn)槲覀兊哪泻⒆觽冋诔砷L(zhǎng)，所以經(jīng)常需要給他們買(mǎi)新衣服，這真是一件令人頭痛的事。

21. It is because our boys are growing up考查原因狀語(yǔ)從句的強(qiáng)調(diào)結(jié)構(gòu)：It is / was because... that...。引導(dǎo)原因狀語(yǔ)從句的連詞有as， because,since,now (that) , considering that,seeing that ^0 而considering that,seeing that這兩個(gè)短語(yǔ)和since,now that意思相近，都有"鑒于……/考慮到"的意思。但強(qiáng)調(diào)句中只能由because引導(dǎo)原因狀語(yǔ)從句，because不能換成since，as，fbr， now that等。

題目來(lái)源：高考丟分題英語(yǔ) > 專題訓(xùn)練8:狀語(yǔ)從句

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