______, they would certainly come and help us.
A．Had they timeB．Do they have timeC．Had they have timeD．Did they had time
A
這是一個(gè)if引導(dǎo)的條件從句的省略，如果包含had, were, should, 或could, if的虛擬條件句省略時(shí)，就要將這些詞放在主語(yǔ)前面作部分倒裝。
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