______ it______ for your help，I couldn't have made any progress．
A．Had；not been　　　　　　B．Should；not been
C．Did；not been　　　　　　D．Not；be
A

試題分析：考查虛擬語氣的省略：句意：要不是你的幫助，我不會(huì)取得進(jìn)步的。如果條件句中有were,had,should 等助動(dòng)詞，可將if省略，而把were,had或should，置于句首,來表達(dá)以if引導(dǎo)的條件句的相同意思。根據(jù)后面的主句I couldn't have made any progress．可知這里是had it not been for your help相當(dāng)于If it hadn’t been for your help。選A。
點(diǎn)評(píng)：當(dāng)虛擬條件句的謂語部分含有were, should, had時(shí)，我們可以將連詞if省略掉，而將were, should, had置于句首。如果條件從句為否定式，注意要將not置于主語之后，而不置于主語之前
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