Ithasbeenyears________Ireturnedhome.
A、afterC
译文：我回家已经有好几年了。此题考查连词 since 的用法。 since 表示“从 (过去某事 )以来，以后或到现在”时，主句多用完成时态。又如：Where have you been since I last saw you? 自从我上次见到你以后，你到哪去了 ?
Wecannotleavethistoughjobtoaperson________.
Amongthefollowingwords,“______”doesNOThaveinflectionalaffixes.
He________hispoorjudgment________JetLag.
—Davidhasmadegreatprogressrecently.—_______，and_______.
Perseveranceisakindofqualityandthatis_______ittakestodoanythingwell.
