Manyothernewtechniquesarenowavailablethatenablemoreresearch(do)inthetesttubetoseeifchemicalsproduceharmfulbiologicaleffects.
正确答案:tobedone

Manyothernewtechniquesarenowavailablethatenablemoreresearch(do)inthetesttubetoseeifchemicalsproduceharmfulbiologicaleffects.
正确答案: