This study includes two parts:Part 1: SSGJ-707 (different dosing regimens) in combination with chemotherapy for first-line treatment of metastatic colorectal cancer.Part 2: SSGJ-707 in combination with chemotherapy versus bevacizumab in combination with chemotherapy for first-line treatment of metastatic colorectal cancer.

Inclusion Criteria:

1. Males and/or females over age 18
2. Histologically and/or cytologically documented metastatic colorectal cancer confirmed .
3. Eastern Cooperative Oncology Group (ECOG) performance status of 0-1.
4. Expected survival >=12 weeks.
5. Signed informed consent form.

Exclusion Criteria:

1. Known uncontrolled or symptomatic central nervous system metastatic disease.
2. Adverse events (with exception of alopecia and fatigue) from any prior anticancer therapy of grade >1 (National Cancer Institute Common terminology Criteria [NCI CTCAE] v.5.0).
3. Inadequate organ or bone marrow function.
4. Pregnant or breast-feeding woman.
5. Known allergies, hypersensitivity, or intolerance to SSGJ-707 The above information was not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.