It must be morning, ____ the birds are singing.
A: for
B: because
C: as
D: since
A: for
B: because
C: as
D: since
举一反三
- It must be morning, ____ the birds are singing.
- The day breaks， __________ the birds are singing.
- The day breaks, _________________ the birds are singing.
- The birds are singing ____________ the tree. A: on B: in C: of D: with
- We must not get discouraged ______ such a minor setback. A: [A] because B: because of C: owing D: since