If it 　　for your help,we would be in serious trouble.
A．isn’tB．a(chǎn)ren’tC．hasn’t beenD．weren’t
D
句意為：要是沒有你的幫助，我們會有很多麻煩。虛擬語氣用在與現(xiàn)在事實相反的條件句中時，條件從句的謂語用動詞的過去式。
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