選B.
如果if放在句首,主謂位置不能調(diào)換；用虛擬語氣時(shí)如果倒裝,只把助動(dòng)詞、系動(dòng)詞和情態(tài)動(dòng)詞放到句首而不把實(shí)義動(dòng)詞放在句首,由于C選項(xiàng)中的had是實(shí)義動(dòng)詞（擁有）,所以應(yīng)選B.
_______time,they would certainly come and help us.
_______time,they would certainly come and help us.
A.If had they
B.If they had
C.Had they
D.Both B and C
Explain it.
A.If had they
B.If they had
C.Had they
D.Both B and C
Explain it.
英語人氣：541 ℃時(shí)間：2020-02-19 19:45:12
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