Themissingboyswerelastseen________neartheriver.
A
所填的詞為主語補(bǔ)足語，因其后有明確的地點(diǎn)，補(bǔ)足語表示動(dòng)作當(dāng)時(shí)正在進(jìn)行中，所以只能使用 playing 。
Whycouldn’tyou________ananswerwhenIaskedyouwhyyouwerelate?
Thegovernmentcalledoutpolicementosuppresstheriot.
It_______fortwohoursnow
WhichofthefollowingisnotmentionedasWTO'sobjective?
______alittleearlier,Iwouldhavecaughtthetrain.
