狀語(yǔ)從句放在主句前都要用逗號(hào)隔開嗎？

1）狀語(yǔ)從句出現(xiàn)在倒裝句中，并位于句首時(shí)，可以用逗號(hào)隔開也可以不隔開。用逗號(hào)隔開，從某種程度上來(lái)說(shuō)更符合習(xí)慣
例題：Only when your identity has been checked, _____.
A. you are allowed in B. you will be allowed in C. will you allow in D. will you be allowed in
其他例句 Only when we had studied the data again did we realize that there was a mistake. 只有當(dāng)我們?cè)俅窝芯苛诉@些數(shù)據(jù)的時(shí)候， 我們才意識(shí)到出了一個(gè)錯(cuò)。Only because there were some cancelled bookings did he get some tickets in the end. 一些預(yù)訂被取消了， 他才得以買到了幾張票。 由于狀語(yǔ)從句位于句首或句中通常用逗號(hào)隔開，所以O(shè)nly when your identity has been checked，will you be allowed in.用逗號(hào)隔開，從某種程度上來(lái)說(shuō)更符合習(xí)慣
2）如果only后面只是跟一個(gè)方式狀語(yǔ)，不是從句，通常不隔開
例題 Only in this way ____ to make improvements in the operating system_ A. you can hope B. you did hope C. can you hope D. did you hope